http://nowherejezfoltodf4jiyl6r56jnzintap5vyjlia7fkirfsnfizflqd.onion/howtos/index.html
[How to use MoneroSSO] First go to the MoneroSSO onion URL using the tor browser, at http://4o4sum57qjta773vn6h7dxgdyuwstcmgqpegewhfzr7m6bh2igsrceqd.onion/ Then as you can see, if you want to sign up, you need to send some monero to the sign-up XMR address. Send at least 0.01XMR there if you want to sign up, then wait 20-40minutes for the transaction to be detected and your account to be created.