The YouTuber rank is a memebergroup for YouTubers! To become one, you must request this and also tell your channel link and create a video showcasing Memebook.
How to request a memebergroup:
Go to "Profile"
Under "Modify Profile", look for "Group Membership". Click it.
When you see "MemeYouTuber", click the text saying "Request membership".
Then you put in your video link.
Done!