If you would like to join Foundation as a creator, you will need to be invited to join by a current creator. One way that you can potentially receive an invite is by joining the Community Upvote.
There is a lot of interest right now to join Foundation as a creator. In order to grow at a sustainable pace and ensure the best experience for our community, we are using the invite system to empower artists in helping us to decide who joins next. Please do not harass creators or spam anyone for an invite.