Can't claim their address.
Could you go to IRC and ask for help? This will be much easier to fix there.
In the wallet, go to file, sign a message
Populate the fields; in the message field (or similar, I'm doing from memory), enter only your nickname. Then click "sign a message".
Then go to
http://hyp.cryptocoinexplorer.com/claim. There, enter your HyperStake Address, EXACTLY what you entered in the "message" field in the walet (so, if you follow my instructions, your nick). Finally, under signature, enter the text you got in the wallet after clicking "sign a message".