why wont it let me create a thread in for sale/wanted forum?

[CamDayKX125(4)]

hey guys, ive heard someone say this before, but the "you dont have permission to access this page " thing comes up. why cant i create a thread there?

 

[truespode]

Too much effort for you to look at an existing thread?

http://www.dirtrider.net/forums3/showthread.php?t=128819

Ivan