You can't, it isn't an acctually real username. The Club Penguin 'Owners' if you like, made up the character/user. Some users claim they have spoken to him/her/it, but that's untrue.
This is SuperJosh635(different person) but the original answer is untrue when you meet Rockhopper where the add button should be there's a box if click that you get an background autographed by Rockhopper it is the same with Aunt Arctic,DJ Candence,The Penguin Band and the Sensei.
you have to wait intell he comes. got to the lighthouse and check if he is there
NEVER
you cant
no.
Rockhopper has now left clubpenguin =(
If you EVER want to find Rockhopper I can tell you which server which room (if he's online that is) Just go to: [url moved to related links] If you find rockhopper there will usually be a crowd of people surrounding him and the room he is in might even be full. But if you meet him he will reward you.
The migrator
Rockhopper leaves after the June 2010 adventure party.
Rockhopper is a character on Club Penguin. When the ship named "Migrator" lands next to the lighthouse, Rockhopper is on it.
If you want to know wheres Rockhopper do the Rockhopper tracker.French is rare,NA Means hes not online.
Rockhopper on Monday (15th) at the pizza parlor at 11am this is not a lie!! from club penguin!!!
clubpenguin