How do i unregister a campsite?

I bought a campsite from the pearl shop and I cant register it because I already have a campsite i got from the quests,

When I try to register my new campsite it says "reached the maximum capacity in registeration".

How do I remove the old one to place the new one?

Please help

Yeah iam having the same problem, i have no idea on where i will unregistered the old tent? but i dont remember having one as i did'nt took the quest for the tent before. it'ts kind of odd... but if anyone can help that would be great. thanks in advance.