Personally I would read the FAQ thread for a general run down of the site and how/when things credit. Then I would try an easy offer and follow the instructions that are listed in the FAQ thread on how to complete an offer.

This is the most basic sort of offer to use to follow those directions (I think the post is a tiny bit outdated with old offer names) and 90% of the people who do it receive credit: Dove ProAge PT -MID