How can I obtain the [YouTube] rank?

Copy and paste this directly into chat:
/g &&ff[&&ccYou&&ffTube&&cc] &&ffHi

Then, once you know how it generally works, you can replace the "Hi" with your message. Note this will only work on the Skywars server.

 

Yep indeed it only works on the skywars global chat

 

I did not know it was only for skywars lol

 

Yep it'll only work though on the skywars global chat aka /g

 

could i do the [Youtube] thing with Skyblock?

 

If you're executive (or is it MVP?) or up, yes.