Why isn't "Centre Membership" on the

I know that I can renew my centre membership by phone or by post, and I know that the web page address for doing so is on the reminder that comes with our new membership cards, but why is it impossible to find without typing in the page address directly?

I always take off the new membership cards, note the payment and date and then shred the letter. Then log in to re-register with East Dorset. OK, I know that's daft but that's me. Once logged in, I go to "My Profile" or "My Membership" 

There is nothing that takes me to register or re-register for a centre. I would expect something in the left hand panel but there is nothing. I've also used the search option but it comes up with nothing.

Am I the only person who finds this to be a problem?