If you have any questions or issues with ZAP then the following resources / forums are available (in addition to this FAQ):
The User Guide (which is also included with ZAP) is a good place to start.
The User Group is the best place for questions about using ZAP.
The Developer Group is the best place for questions about working on the ZAP source code or extending it via add-ons.
The Scripts Group is the best place for questions about extending ZAP using scripting.
For more interaction you can also join the Mozilla #websectools irc channel which is where many of the ZAP core contributors hang out.