what am i doing wrong?

OK think i know what the problem is but dont know how to fix it...
I want users only be able to view/edit their own records.
In the advanced security section i set it so that this is possible but this is where i think i'm going wrong and dont know what to do.
What do i enter in the
Users Table OwnerId field

and the

Main Table OwnerId field
I want user to be able to login via a username field (not the id auto added by access) and a password field in the database.
Anyone out there how can help?

think you set them both as the id you want to recognise the user by..
i.e username

Hi,
make sure you selected correct field as a key field. Key field value should be unique for each record and cannot be NULL or empty.