How did I get a Medal and a dedication (Green)?

There are two ways

Hard Work : Post alooooot of 画像 , 記事 , アップロード 動画 , リンク , create アンケー and wait for people to like または ファン your stuff ( あなた may get a little old waiting )

Other way is called

Bad 尻, お尻 : Post little but make aloooot of people ファン your stuff ( あなた will surely get a medal within a week )

あなた contributed a lot to the spot and people liked it

I believe ファンポップ chose to keep the exact way to earn medals, but the most 人気 way it to contribute alot and get lots of people to ファン your contributions.

I personally believe the medal system is screwed (I've seen フレンズ get die-hard メダル in クラブ they can testify they've never contributed to), but あなた might as well give it a shot.