Choose Find/Change from the Edit menu or press Control+F.
Type the text you want to find in the Find field.
Type the replacement text in the Change To field.
Press Return or click the Find button to locate the next occurrence of the text.
Click Change to replace a single occurrence.
To find and change additional occurrences, click Find and then Change.
Or, click Change All to replace all occurrences.
There is no Undo for Change All.
Click Close when you are done.