The way to enter the bounty program is to register on the form that is already in the forum where the bounty is listed. Prepare a facebook, twitter, telegram, linkedin, reddit, Instagram account to register according to the existing bounty. Or follow other bounties besides social media, there are many choices there. And the most important is the wallet to receive payments from the bounty. Use a wallet from Myetherwallet, metamask, imtoken or something else but not a wallet from exchange.