Problem activating videos on my website

Problem activating videos on my website

I try the reactivate the plugin for tutorials but every time I try to activate it I get this:

That domain is already registered by you or another user! Contact support for help

My domain is fixrunner.com

Im try to add it here: http://www.fixrunner.com/wp-admin/options-general.php?page=wpmudev-videos

Also here:

https://wpmudev.com/wp-admin/users.php?page=vidapi

please help

Thanks

Shlomi