Go to this website:
http://support.graalonline.com/
Log in. It is easy to create an account. You do not need to use your Graal password. You do not need your normal account name either. You will need your forum account name so the forum administrators know on which account you have a problem. Submit a ticket. The exact type will be Forum - Bans/Other. Make sure to detail the exact problem, which in this case is you are not able to access the graphics forum.
I am sure the forum administrators will work with you to resolve your issue quickly and promptly.
You can create another thread to submit your graphic when you have worked to make the best possible final product.