You are asking about how to make money by promoting a Ico and cryptocurrency, and that promotion called bounty program in cryptocurrency field.

So if you want participate in bounty then search in google by adding bitcointalk word after your searching keyword and you will find your answers easily. Just read all threads and replies.

There mainly few types of bounty program,
1. Signature bounty:- You can earn cryptocurrency by adding signature in bitcointalk account. This bounty is depends on what rank you hold maximum signature bounty program requires min. Jr. Member rank to participatr in their bounty. The more rank you hold more payment you will get.

2. Content Bounty:- You can participate  in this bounty program by creating video or writing article content. Payment is totally depends on the quality of your content.

3. Social media bounty:- You can participate in this bounty by sharing posts in social media.Payment is totally depends on the bounty managers rule.

4. Others:- There also other ways to participate in bounty but that are totally depends on promotion strategy and promotion way like referral, infographics and other tasks.

You can find bounty program in bitcointalks bounty section and also there are lots of websites who hosts bounty program like
AMINUR RAHAMAN:
1. BountyHive
2. Bounty Portals
3. BountiesAlert
4. Bounty Platform
5. AmaZixBounties
6. BountyLord


Most important before joining a bounty do reaserch on every projects which you want to participate cause all bouties are not good or legit. Check their tech, team, roadmap, token matrics, see reviews and replies , read white paper and others.