how do you become partnered?

Having only 5 videos is not gonna help you man. I would release some more before you apply. And the cover of the Bieber song might be considered copy written material...although its pretty hard to hear the actual music in the video so you might be alright. A lot of us got it through they seem to partner us little guys more then any other network.
well as you saw the thread title you must know what this thread is about,, i have more then 500 subs and there are people with 500 subs that have been partnered.

so i wanna know how you become partnered?
to check the copyright go to settings and scroll to copyright strikes and that stuff
Yeah, I'd recommend investing more into your channel, and developing a following. Then, you have a bargaining chip for when applying for partnership. I'd recommend it!