Do you have to like submit a whole bunch of articles or something to get medals?

No, I mean, articles help... but really as long as you post A LOT of content to a club, whether it be videos or images or polls or questions, as long as you're posting often and a lot.

bro i only submitted one article... and i got a medal... it's all about participation... the more you comment, post pics, vids, links, or articles, and make polls, quizzes, and questions the more likely you will get a medal. i just made tons of comments and posted some pics and polls. :D

well
u can also add other things
u search a random thing on google n just share it with articles
if u want any help
u can ask freely

Not just that but also pictures,videos and links. It takes a long time to get the medal but at the end you get it.

Take it from me, I have over 25 medals^^