Ok, there are several ways.
Firstly you must be able to provide proof of insurance when purchasing permits so have your card at the ready.
1) You can pay £5 for a day permit, this can be purchased at the hut on the promenade.
2) You can buy a yearly permit for £35 from the hut.
3) You can join the north wales powerkite club at turbulence (http://www.ukkiting.com and email adam) for £5, then a yearly permit for the beach costs £10.
Either way you need insurance. Goto http://www.ukkiting.com and check out the beach restrictions page or ring them at the store.
Hope this helps
Rick
(p.s. the beach is really empty at the moment cos hardly anyone has a permit yet)