ok so i just paid for the subscription, now what?

so after I made payment i was taken to a page to download the WPMU DEV Dashboard. however i dont want to donload it ( I think) but rather install it form a list on the dashboard of the CPanel at JustHost. Im guessing that because that's what I did for all the other pluggins I've used

What pluggin am supposed to search for on the cpanel dashboard?
Or do I in fact have to download something?