how to report for scam/

i think a lot of people will get scammed by this guy so i wanna stop him.
i tried to post a thread on the tbm forum or something but all i see is topics with tips

Go to [Only registered and activated users can see links. Click Here To Register...] and choose the options that fits your case.

You should read [Only registered and activated users can see links. Click Here To Register...] aswell.