For the YT+ Rank you almost must have the YT Rank. The YT+ Rank is also the Server leading together with the Administrators. You can't apply for the YT+ Rank, only the Administrators can invite you for the Rank... If you have more Questions about the Ranks ask under my comment.
~Jannik / BearInYellow ^^
Mit Freundlichen Grüßen Jannik / ImJxnnik