The first thing to do is visit the main page of the site:
http://www.Sunfury-Gaming.foromotion.net/

Then pick out the relevant forum topic appropriate for your discussion. For example, if you have a Computer-Bug question, you can scan down the page and click on the link for the Support & Request Forum. Or if you have a question about World of Warcraft, you can put your question in the Game Discussion/Fast Threads Forum..

Let's say you have a Computer-Bug question. Scan down the page and click on the Support & Request forum link. You'll find yourself here:
http://sunfury-gaming.forumotion.net/support-request-f10/

To the left of the red letters indicating what forum you are in, there is a button entitled New Topic. Click on that button. This is how to start a new discussion or ask a question.