Well, if you get enough views or have enough contacts (or get a CMS) then you would apply. Give them your channel, socialblade, an email to contact you on and a paypal email. If you are accepted, you should get something like this:
Depending on the network which you're looking to obtain a partnership from, you will need to have a certain amount of daily views - normally over than 700+.
I would recommend attempting to get partnered with a large network, such as Machinima, TGN, Yeousch. To check how many dailys views you're receiving, visit here - http://socialblade.com/youtube/user/
(Type in your YouTube channel name at the end of the above link)
Yeah, the ones on HF do indeed work. If you want to do it legitimately, get 500+ views daily, have monetizing enables, and most important of all, do not have any copyright infringements on your videos.