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You need to provide your STEEM account name (i.e. nikflossus) .. don't pick a new name.

I used my steemit name. Didn't work.

It seems one of my error messages is misleading! There already is an account registered for steem_account nikflossus. It has an email address *********[email protected]. If this is yours, then you can get a verification mail or reset your password.

Unfortunately, I can't do the troubleshooting for the site. You'll need to contact @xeroc for that. You can probably find him on Steemit.chat for assistance.