how do आप get a medal for a club?

Fail.

प्रस्तुत करे some good content (Emphasis on the good content. Nothing duplicated, broken, spam, etc.) and hope that it gets 'fanned'[by other people who like your content] at a decent rate and stay active at the club. Sooner या later आप will get your medal.

Contribute to it a lot. Add comments, answers, wallposts, good pictures, videos, etc.

link

This लेख pretty much sums up about medals.
आप have to stay active, प्रस्तुत करे things in maybeevery section (videos, picks, etc.)