Adding user role selection box

Hey guys,

I really need my form to be able to tie into wordpress roles. My current registration form has a plugin where users can select their own role and thereby access only role specific parts of the website which allows me the freedom to not have to manually assign them roles after registration. The plugin is called “WP Roles at Registration”

I see there is a placeholder field in the custom registration form builder,

How do I create a field that allows users to select their own role while filtering out the administrator role?