As a full member in the forum you should already know your way around the forum, this your question is meant to be asked by newbies and not a full member like yourself, what have you being doing all through your days of newbies, junior member, and member ranks.
The person in question is an old member of the forum who I believe was active back when the forum merit system had not been implemented and had been away for long before coming back to the forum, so it's okay to feel a bit lost, although if the OP had taken out his time, he could have identified what he or she really needed to figure out about signature and bounty.
This your question actually point to the fact that you have not really learned your way around the forum, bounty is mostly done by spammers and you should focus more on other good sections of the forum instead bounties.
The majority of the people who participate in bounties might be spammers, but not all are spammers. There are still legit hustlers on that board who are just looking for a way to earn free tokens, which I don't think is really working well for them considering the number of failed projects and scam accusations against some bounty managers and some scam project heads too. Bounties are almost a complete waste of time.