You don't need to sign up there, you have to login there with your steemit login name and your private posting key (wallet->permissions->show private key).
The 'sign up now' link there is to create a steemit account, but you already has an account here.
You don't need to sign up there, you have to login there with your steemit login name and your private posting key (wallet->permissions->show private key).
The 'sign up now' link there is to create a steemit account, but you already has an account here.