Completely Stuck

I am completely lost. everything was working ok except that my domain name was registered in a registrar what I hadn’t even heard of. Then I paid WordPress $18 to redirect my domain name to the WP Engine server I purchased hosting on. This has not been done to my knowledge. Furthermore, when a friend helped and installed a theme I had for my wordpress site, the whole thing crashed and now appears like this:

http://adambentel.wpengine.com/

When I attempt to login to the dashboard of my wordpress site, it redirects me to the following:

http://adambenteldotcom.wordpress.com/wp-login.php?redirect_to=http%3A%2F%2Fadambentel.wpengine.com%2Fwp-admin%2Fthemes.php&reauth=1

I have no idea what is happening as I am not a programmer.

Please help me as soon as possible.