i can't login into my Dashboard

hey guys,

i install geocraft theme than i tried to test it so i set up a listing and everything, than i was trying to get back into my dashboard with mydomian.com/wp-admin it keep redirecting my to this http:// mydomian.com/wp-login.php?redirect_to=http%3A%2F%2Fwww. mydomian.com%2Fwp-admin%2F&reauth=1 and i always end up at sign up page like in the pic
how can i fix it and be able to get back to my dashboard.

thanks

 

where are you install wordpress? in the root directory or in a subdirectory of main domain ?

 

it an Addon domain to my hosting account

 

look and this tread , i got same problem , i just resolve it.
http://www.inkthemes.com/community/threads/cant-log-in-to-wordpress-dashboad.1779/