I have been using Daikon Forge and PlayMaker together extensively as well. If you haven't already, start by looking at the example scenes. The one scene in particular that is of the most use is called "Game Menu". That shows a very good example of a menu as it shows/hides elements based on where you're at. It's very complex, but you'll learn a lot.
After you have reviewed that scene and understand how the elements work and interact, you can add a DF GUI interface wizard to your scene. From there, you can either make an empty game object for all of your PlayMaker UI actions, or you can add a PlayMaker FSM to the DF GUI UI root itself.
Personally, I like to keep all of my UI stuff in one place, and the UI root object seems like the best place, so I add my FSM there. I also make FSMs for each button (create a template!) and have a state that performs the "onclick" action which simply broadcasts an event to the UI root FSM. From there, it's all PlayMaker!
Please post again if you need more details or whatever. I don't know your experience level with playmaker or DF, so this was a pretty simple "overview", but feel free to ask more questions. I'll monitor this thread =)
