If you have roles on several different brands or have several roles on a specific brand you can change between your roles. There are two ways to change your role:

The first way is the quick change menu in the top left. Here you can quickly select which role to use. 

The second way to change your role is to click on your name in the left menu. This will take you to your profile page. Here you can see all you roles and choose between them in a drop-down menu list. You can also logout, reset your password or change language settings on this page. You can also remove roles that you no longer want.