To add line numbers:
Go to Page Layout tab on the ribbon
Page Section group
Click Line Numbers icon
Select one of the options from the drop-down list
Click Line Numbering Options...
Click Layout tab
At the bottom, Click Line Numbers... button
The common option is Continuous /OK
Line numbers will automatically be added to the left side of your document.
To remove line numbers, remove the check mark in the Line Numbers (previous image) / OK
July 05, 2012
Sr. Arlene Callahan
Nashua, NH 03060