Margot, the DO points accumulate automatically as you interact throughout the community. You get points for posting, for commenting on posts and for liking art, posts & comments. As your points accumulate, your DO level increases. I’m actually not sure how many points you need to increase a level. At number 1, with over 2000 points I’m at level seven, and I believe the top level is 10. On your profile page, under your name, you’ll see DO badges and your DO level.
Charlie is still working on this, so there isn’t very much information on it, yet. I believe that eventually, you will be able to redeem your points for something.
For now, there is nothing to do but interact with other members. The more active you are on the site, the more points you’ll have built up once the feature is completed.