tagMe

Please forgive me if this is obvious. What I would like to be able to do is manage the tags: 1) to remove some entries in the autocomplete fields, for instance to remove mis-spellings etc. 2) to be able to add shorter, more general tags, related to ones already there. For instance if 'Diffractive Optics' appears in autocomplete, I would like to be able to add 'Optics'. 3) understand how I can add multiple, comma separated tags, as I noticed in the documentation somewhere. I have looked in the module menu selection to see if there is a Tagme module menu entry, but I can't see one. Apologies if I am missing something obvious? I've only been using the module for a day, but I'm really liking it so far. Thank you.