How to add new roles in drupal 7? Drupal by defaults gives us three roles 


Administrator
Authenticated users
Anonymous user


Can i add a new roles in it? Like:


suscriber
trusted customer
Yes, it is possible.


Go to "Home » Administration » People » Permissions"
Select the roles shown at the top right 
Add a new role using the input textbox at the bottom


Your role will be created.