I would like to participate in the campaign for new currencies

Then you have to go to the bounties section of Altcoins here: (
https://bitcointalk.org/index.php?board=238.0) and then you have to search what kind of bounties you would like to join, mostly bounties are divided:
- Signature
- Facebook
- Twitter
- Blog
- Medium
But you have to read the rules set by the campaign manager and follow it to the heart so that you will received your bounties usually paid at the end of the ICO.