Edit button and no adds

Hi all,
I have looked through a lot of threads but cannot find an answer to
most likely a simple question?

When I click on a button I have to edit a record, a form opens in edit
mode and specifies filtered 1 record. Now if you use the mouse or
selection arrows, it will go to a blank record. Is there anyway to
prevent this from happening? Just to remove anything but that 1
record?
Thanks
Dave