Connect WPMU

Hi.. I got issue when connecting WPMU into my site direct-hub.com. It said that it was connected using my other account on trial (it was a***a@yahoo.com).

I checked but found nothing connected onto that trial account too. I want to connect to this account instead (c***s@gmail.com) but still cant.

Could you please help me solve it? Thanks in advance.

Cheers,
An