Hi,
It depends on what bounty you would like to enter.
for example:
Twitter campaign.
Application:
1. Follow Cointed on Twitter
2. Register with this form https://docs.google.com/forms/d/e/1FAIpQLSehJnLU-8MUboO95EnycBdZVCKz2VGtVah_9vr3OHLBL8s3OQ/viewform
3. Register your tweets/retweets within one hour after tweeting/retweeting with this form. https://docs.google.com/forms/d/e/1FAIpQLSdjV5xWRmfIslnVwnp653NcsTBDE_gHNhpi50KQSdwFkR3htw/viewform

Rules:
1. You must have Jr. Member or higher rank in Bitcointalk
2. Your Twitter audit will be taken into account for the number of followers (only real ones).
3. You must enter “#Cointed” or “@cointed_ICO” within your tweet. 

here you can check all the bounty campaign: https://bitcointalk.org/index.php?topic=2286249.0
here is the spreadsheet where you can check the participation status: https://docs.google.com/spreadsheets/d/1FVjHwOuXfRCYaxgUfa8QYipbrP-dzAiuTS_DpCFHi08/edit#gid=1369304242