QuickForm question

I'm reasonably new to PEAR and have just started using QF and DB. I'm currently trying to create a form which allows a user to edit a given record in the database. I'm sure the process of selecting the data from the database then creating a form which uses the data which can then be edited and submitted to update the database is familiar. What I'm hoping is that I can do this using QF. I did note mention of setDefaults, but I'm not certain whether this is what I am needing to use or how it would be used. If I'm on the right track with setDefaults I would really appreciate being pointed toward some examples of how to use it and if not, being pointed in the right direction would be appreciated as well. TIA, Jason