I have the latest word for os x? When I try to add a word (that is underlined as misspelled), I can't seem to do it. The 'add' button in spell check is grayed out. I went into the settings and didn't see anything besides a 'custom dictionary' feature that I fiddled with but didn't want to enable or create just for a few words (like the spelling of my last name, biological terms not in the dictionary, etc.) Any tips?