First navigate to the support section it can be found here.
Next hit the new topic button as shown here.
Next write every thing out. Make sure it is detailed with every detail that you can provide. Crash reports help if you have them. Make sure it also has a proper title it helps us know your issue better as well.
Finaly! You have made your support request. We will get to you shortly. Please dont spam bump your post. It becomes rather annoying and does not heighten your chances for help.