You find a bounty campaign that is says you need to put this signature on your profile.
Well every bounty campaign for coin has the signature code for their signature on their official bounty announcement. All you have to do is copy that code and paste it at your profile. How to do that ? Go to PROFILE -> FORUM PROFILE INFORMATION -> and you will see Signature at the bottom. Just paste it there, save changes and you have the signature on your profile from the coin bounty that you have participated.
Mostly coins say to keep your signature until the end of their campaign so you can receive your payments properly. And be careful, always read the rules about the bounty campaign. They are always different on different coins.
That's it, on how to add a signature on your profile for participating into a bounty campaign.
Hope it helps
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
Need any help, let me know with a reply in here
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
cheers*
@cryptodude42