form - fills tables but doesn't read from them

I have two related tables - Events and Contacts. I have created a form which
populates both but the only records it will show are the most recent ones
typed into the form itself - it does not pull in the existing information
from the tables. I have checked the Properties and Data Entry is set to No
and Allow Edit, etc are all Yes.

(Interestingly, it also populates the form "Events List" - from the Access
2007 Events Template - which I would like to be able to use but which again
will populate the Events table but won't update from it).

What do I need to do to get a mutual dialogue going between the tables and
the forms? Or is it a case of re-inputing everything through the form(s)?

I hope that makes sense. If I need to use code, please could it be explained
very simply!

Many thanks