Before we try to explain what Change Users Roles does, lets try to explain what exactly users roles on WordPress is?
WordPress has built-in types users roles, each user role has its own capabilities and permissions. As an example, we all know the administrator user role.
Change Users Role was a 3rd-party plugin and it appears that this plugin does not exist anymore.
We have created 2 unique resources that gather all the Wishlist Member dedicated plugins: