Indent is the distance from the left and right margin of a paragraph. It is used to improve the efficiency and readability of the paragraph and makes the paragraph look more attractive. In paragraphs, an easy way to apply indent for the first line of text can be created by moving the insertion pointer to the begining of the line and pressing the tab key on the keyboard. There are two ways to apply indents:
Using Icons Using Dialog Box
Using Icons:
(i) Increase Indent Icon  The increase indent icon controls the space between the paragraph and the left margin. Each click on the Increase indent icon moves the paragraph 1/2 inch away from the left margin.
(ii) Decrease Indent Icon  This is reverse of increase indent. It undoes the indent applied by increase indent. Each click on the Decrease indent icon moves the paragraph 1/2 inch away from the right margin.
Using Dialog Box:
(i) Format ⟶ Paragraph displays the paragraph dialog box as shown in Figure 6.20, select the Indent & Spacing tab which has the indent group which has three options.
(ii) Left Indent: This is the default indent where a paragraph is moved away from the left margin. In the paragraph dialog box, in the "Before Text" spin box, enter a value which moves the paragraph away from the left margin.
(iii) Right Indent: This is another type of indent which moves the paragraph away from the right margin. Enter a value in the "After text" spin box of the paragraph dialog box, which results in right indent.
(iv) First Line Indent - A first-line indentation indents the first line of the paragraph. It is the most common way to start a new paragraph. This indent can be applied by Format ⟶ Paragraph ⟶ Indents & Paragraph tab, select first line option in the indent group, enter a positive value which results ill first line indent.

Steps to find and replace a text
(i) Type the text you want to find in the Search for box.
For Example: To search for a word "Bombay" in a document and replace with "Mumbai", enter the word "Bombay" in the Search for box
(ii) To replace the word with different text, type the new text in the Replace with box
Click Find button, to start the search, the found word is highlighted
(iii) To replace text, click Replace button.
The highlighted word is replaced with the word given in the Replace with box.
(iv) Click Find All, Writer selects all instances of the search text in the document
(v) Click Replace All button, Writer replaces all matches.
(vi) Enable Match case to perform the search case sensitively so that uppercase and lower cases are distinguished separately.
(vii) Enable Whole Words only to make the search more specific to words used separately alone.

Alignment	Action	Icon	Shortcut Key
Left	Aligns the paragraph with respect to the left margin		Ctrl + L
Right	Aligns the paragraph with respect to the right margin		Ctrl + R
Center	Aligns the paragraph with respect to the center of the page		Ctrl + E
Justify	Aligns the paragraph with respect to both the left and right margin		Ctrl + J

The header is a section of the document that appears in the top margin, while the footer is a section of the document that appears in the bottom margin of the page. Typically, headers display the title or chapter name, author name of a document while the footer displays the page number, date, time etc which gets displayed on all the pages automatically.
To Insert Headers and Footers:
(i) Select from the main menu Insert -> Header -> Default
(ii) The header text area is separated from the normal text are (a)
(iii) Enter the text that is to be repeated in all pages or Select Insert -> Fields -> Title.
(iv) The Header dialog box is displayed
To insert a Footer, the steps are as given below:
(i) Select from the main menu Insert -> Footer -> Default
(ii) Piace the cursor in the Footer part of the page.
(iii) Select Insert -> Fields -> Page Number.
Once the headers and footers are given in the first page, the same text appears in all the pages.
Inserting and Formatting Page Numbers:
Once the Header/footer area is enabled, the page numbers can be inserted by performing the following steps:
(i) position the cursor where you want to insert the number
(ii) choose Insert -> Fields -> Page Number
(iii) The page number appears with a gray background
Normally, the page numbers appear as 1,2,3 ..... , To change the numbering style, the following sequence of steps can be performed:
(i) Position the cursor where the page number has to appear
(ii) Select Format -> page, which will bring the page style dialog box
(iii) Select page Tab
(iv) In the Layout settings, select the format drop down combo box
(v) Select the desired style and click OK button

Changing or setting page margins in open office writer can be done in two ways:
(i) Using the Page rulers quick and easy, but does not have precise values
(ii) Using the Page Style dialog box can specify precise values for the margins
By using page ruler:
(i) The shaded sections of the rulers are the margins.
(ii) Hold the mouse pointer over the line between the gray and white sections
(iii) The mouse pointer turns into a double headed arrow.
(iv) Hold down the left mouse button and drag the mouse to move the margin and release it at the required point
(v) The new margin is set.
Using the Page Style dialog box:
To change margins using the Page Style dialog box
(i) Right-click anywhere on the page and select Page from the popup menu or select page tab of page style dialog box
(ii) In the Margins boxes, specify the values for left, right, top and bottom margins.
(iii) Click on Ok button. Displays the page style dialog box showing the margins.