I. To replace something

Either:

select the Replace tool in the Searching group on the Home ribbon tab

or

press <Ctrl+H>

The Quick Find tab on the Find and Repalce pane opens.

Type a string to match in the Find what field.

(Optional) Select the Look in and Find options to specify the extents of the search and how the string should be matched, respectively.

Type a replacement string in the Replace with field.

Either:

click Find Next to highlight the next matching string

or

click Replace to replace the currently highlighted match

or

click Replace All to automatically replace all the matching strings in the file