There's a lot of "maintenance" currently going on on the PCA website, increased spam filters etc. and I know that others have had the same problem as you are having. You could try another browser or wait a while to see if anything changes. I don't think there is any way of editing your profile.
You could register again with another email address or as I have suggested wait to see if this problem rights itself. You could also try clearing your browser cache to see if it helps but my opinion is that the problem lies with the PCA website at this current time.