You are a junior member on the forum and don't know how to be part of a bounty programme showed you have not been following the events of things on the forum and even visiting the right section of the forum. Bounties are found in the Alternate section of the forum specifically the market place sub section
https://bitcointalk.org/index.php?board=238.0 all you then need is to find which one you can be part of with the requirements and the rules. There are tons to join in.
Don't give the guy crap for asking an earnest question...geez.
And just looking at the swarm of other posters who are just acquiescing to whatever opinion helps them to up their activity and post count without making any real contribution...the herd mentality here is disgusting sometimes.