There are several places you can go to get help on using FSL. Your first port of call are these webpages, but where this does not address your question, the FSL mailing list is the principle avenue for getting support. You can join the mail list here and/or subscribe to the RSS feed of the list.
Before posting your question to the list, please search the archives to see if your question has already been answered. You can do this here:
PUT A SEARCH OF JISCMAIL HERE