The /ranks command will warp you to a board of signs, which you can right click to view the perks of that rank. After the update recently to ranks, along with the Champion rank however, it does need to be updated.
That's in part why I put it under the Prison tab (don't take that like I meant it super tacky. I meant it to have a sliver of tack).
Here at Noble Craft, we are constantly trying to improve our server to make it better for everyone. As for the /ranks, we decided to include that with prison just so we can completely confuse our players. Sorry if we caused too much confusion, but we also like to have fun here too! Even if it is in really strange ways!