Adding a custom role on your meetings account can be done via Users > Roles and adding a New Role.
Click the New Role button.
Select a Role to use as a starting point. This will help you to narrow down which permissions you want to assign to the new role.
Enter a name and description for the role.
Select permissions you want to assign to the new role. check the boxes on the permissions you want to grant. Click Create Role.
NOTE: Depending on the role you selected as starting point, some permissions will be unchecked if those permissions are not granted to the role selected.
On the notification, you will have the option to assign users now or later.