I cant seem to join the Private site. When the credit card details are sent the "please wait" page just keeps reloading. I'm using Mac browsers (Safari and Mozilla). Is there a problem using these browsers?

I found that visa did that to me. So I went to the Visa website and got my card secured for internet use and the problem no longer occurred.
Do you live in North America? I am not sure how visa works in the rest of the world.