Forms :: Saving / Editing A Record Using A Form With Combo Box

I have a form that I need to use to add new clients to a table in my database, lets call it tblClients. On this form I have a combo box which, when selected, will drop down with the first and last names of all clients in tblClients, as well as their Client ID. Once you select a client from the drop down menu, it populates all of the fields in the form with that clients info (Client ID, fname, lname, address, phone number, etc. etc.).

I need two other things on this form: one button that will save or modify whatever current record is currently pulled up, and one button that will start the process for entering a new client, so basically it would blank out all of the fields and fill the Client ID field with the current number +1.

As of right now I have the form made and the combo box works, in that I have 3 dummy clients in the tblClients and when I select each client from the combo box it will populate the fields on the form with the info. I'm using some simple VBA on the combo box such as

Me.FirstName = Me.cboBox.Column(1)

and that seems to all work, but the problem is trying to save/modify data to tblClients. The only record in the actual table that gets modified seems to be the first record. For example, if I pull up client with ID #3 and change his address or phone number, what happens when I click to save the changes it takes client ID #3 record, overrides it with client ID #1, and then client ID #3 is the same as client ID #1 except with the old information. I'm not quite sure why this is happening.