The link in my comment takes you to an article that explains the whole thing:

https://steemit.com/steemax/@artopium/seriously-look-in-your-wallet-have-you-been-invited

But as a quick summary I'm inviting you to automatically exchange upvotes. So when we both have new posts SteemAX will automatically have our accounts upvote eachother's posts. It uses SteemConnect to do the upvoting so it's completely secure. I just finished programming it (see my other account @learnelectronics) and I'm trying to get people to start using it. I'd like to have a moderately substantial user base before launching my promotion campaign. But if you read my article it should (hopefully) explain the steps you'll need to take to accept my invite. There's a number of things to do including sending at least $0.001 sbd to @steem-ax, which is the amount I sent you when creating the invite. You can see this in your wallet. You can also see your invites by visiting:

https://steemax.info/@davedickeyyall

But you'll need to sign into SteemConnect first. Let me know if I can help. You have a big following and if I could get your support on this project by way of using it and possibly word-of-mouth it would be a big help. Thanks!