Read the FAQ
Read the documentation
Some documentation is available on this wiki.
Search Before Posting
There is a good chance you're not the first person to experience the issue you are having. By searching the forums, you may be able to find posts about the problem you are experiencing. Also, search the existing tickets in the project's Trac system. Make sure you do not create a new topic on something that has already been discussed before (known as posting a duplicate or 'dupe').
Be Patient and Have Good Manners
Remember that support provided for the FileZilla project is made by volunteers; no one is paid to answer you. So, please, do not demand an answer, ask for one. Using good manners and words like "please" and "thank you" go further than you might think.