I had been a member, pinksticks. But had lapsed. Perhaps cancel your current membership and rejoin?
I had trouble logging it on at the start.... I followed the link that it specified on the groupon voucher. Then I had a bit of trouble finding the bit to put my groupon code in (I had to go to the next page and then there was a groupon code link sentence a bit further down the page to use). Then it worked a treat. But I do think that Groupon can be a bit glitchy as I had to use their password retrieval service first, then the transaction kept showing up as no working. It took about 4 times before I could finally buy the voucher.