User permissions

I installed and configured the plugin WHMCS MU Provisioning. When I select the product, the website is created at WordPress.

The problem I have is that when I try to log in into WordPress with the new user and password I got this error: You do not have sufficient permissions to access this admin page. So user can not edit his website.

Somebody knows what i should do in order to give the users permission to edit their websites?

Thanks a lot!!