Your model files are the files that access your database to pull in the business logic of
your application you better leave those alone. and changing any files in the application
is going to change the way it works.
To make it accessible to everyone you need to find the default controller and allow access
to everyone there. You can find the default controller by looking in the config/routes.php file
under the app or application folder CodeIgniter 3 it is application and CodeIgniter 4 it is app.
What did you Try? What did you Get? What did you Expect?
Joined CodeIgniter Community 2009. ( Skype: insitfx )