forum signature links

Hello and thanks for your time ... I just read a dozen forum threads about "selling outside the marketplace" and confused myself completely. I'm truly sorry if these questions have been adequately explained in the past, but I have a few scenarios to run by you. Some of these questions are...

Hello, I am looking for people who have good, old and active profiles on tech/video/computer forums with relevant organic traffic. I would like to order links to be placed in the signatures.