I am having trouble figuring out
how to start a new thread in the "Want your NinjaTrader indicator created, free?" forum ?

pistol 

I am having trouble figuring out how to start a new thread in the "Want your NinjaTrader indicator created, free?" forum ?

That isn't a forum, it's a thread.

Click Post Reply at the top left or bottom left of the thread to add a reply to the thread.

To post a new thread, go to the subforum and click "New Thread" on top left or bottom left of the thread listing.

And watch this video, which is sent to all new members when they sign up:
https://nexusfi.com/help-tutorials-how-tos/10905-general-tips-using-forum.html

Mike