When you want to find and replace text, open the Find and Replace box by clicking Home > Replace.
Click Home > Replace.
In the Find what box, type the text you want to search for and replace.
In the Replace with box, type the replacement text.
Choose Replace to change that instance of the text, or click Next Result to skip that instance of the text and go to the next one.
To change every instance of that text in the whole document, click Replace All.