Hi, @krakonos, I'm moderator of Snax. To start getting rewards for posts you must Sing Up on snax.one. There is also no need to use the tag "snax" in your posts; we will automatically calculate your activity and charge the reward.
There are many posts about Snax on Steem now, you can use one of them as instruction) for example https://steemit.com/snaxbountyoprogram/@milaan/review-of-snax-as-a-decentralized-social-media-overlay-for-monetizing-content-with-existing-popular-social-media. There you will find information on what Snax is, how to Sing Up and how to use it. In case of problems, you can contact our Discord channel for support https://discordapp.com/channels/509371605542109185/578602301069983766. Sing Up and start getting rewards)