How do I post to the Tech forum

I want to add to submit a thread to the forum section but every time I go to start a thread I get
"

1. Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
2. If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.

I have the photos and text to post a how to, on making a custom horn ****on.

 

I may be wrong but I believe you just post it on the main board and it either is picked [or not] as worthy?

 

Cool I will give it a try.
thanks