Add, delete, or edit words in a custom dictionary

Open the Custom Dictionaries dialog box by following these steps.
Select the dictionary you want to edit. Make sure you do not clear the check box.
Click Edit Word List.
Do one of the following:
To add a word, type it in the Word(s) box, and then click Add.
To delete a word, select it in the Dictionary box, and then click Delete.
To edit a word, delete it, and then add it with the spelling you want.
To remove all words, click Delete all.