How Do I AutoFill a Form

[dtabse]

I am using the downloadable contact list template as a base for a database. It has a contact list form that has an open button to open a contact detail form and it autofills everyones information correctly between the two forms, however i have a button that opens up another form from the contact details form and it will always autofill the information from the first person i created. The fields between the forms all have the same control source, so i think it is just taking the person with ID = 1. How can i make i so that when the form opens, it will fill the fields based on whos information i was looking at in the contact details?