If you're adding to a Datasheet view of the table, simply put your cursor in
the row at the bottom of the datasheet and enter the data for the person.
Is there more to this question? This is, as DL pointed out, very basic. How
did you get the original entry for the person into the table? How did you add
entries for other people? Are you perhaps running into problems entering
non-unique records?
I'm just grasping here, trying to get at what the real question might be.
Help us out. People here are willing to help, but we aren't going to do your
legwork for you.
What Access book(s) are you using?
Good Luck!