Janet, there's almost no way to get a question answered here in 10 minutes unless a) someone reads it right after you posted it, b) they happen to know the answer off the top of their head, c) they type quickly, and d) you've turned on email notification.
It's a free site, provided by the hosts (Access World) and manned entirely by persons with too much time on their hands, for free.
Now, that's not to say you can't get a problem solved in 10 minutes here. Look into the search function of this site, if you choose your words carefully you can often come up with several workable solutions in a matter of moments, often tailored to a variety of skill levels. One thing to keep in mind is that the search engine searches for strings of letters, so searching for (in your case) 'add entr combo box' would match:
adding entries to combo boxes
add a new entry to a combo box
add this entry to my combo boxes
etc.
Good luck,
David R