Replacing and Deleting Macros
If you make a mistake while creating a macro, stop recording and start over with a new macro, giving it the same name as the botched version. Word will replace the old with the new.
If you're having trouble with a macro and you want to delete it, choose Tools, Macros, Macros and delete any macros on the list that you no longer want. If you're deleting a macro that has a toolbar button, you also need to remove the extra button; choose Tools, Customize, click the Commands tab in the Customize dialog box, and then click-and-drag the button that you want to trash right out of the toolbar. You can drop it just anywhere at all on the page proper and it will disappear.
A word of caution on removing buttons. Be sure you drag away the right one. If you accidentally throw away one you like, it can be a bit of a pain getting it back. (Not that I have occasion to know, of course.) But resetting the toolbar will do it.