You can can always add or remove access to our app using Salesforce's standard profile functionality. For example, let's say you would like to provide access to User A, who has a Marketing user profile (you can find your users' profiles from Setup > Administer > Manage Users > Users).
Go to Setup > Administer > Manage Users > Profiles and click on the Profile Name (Not the "Edit" link). Once on the profile, look for the "Enabled Apex Class Access" and "Enabled Visualforce Page Access" sections.
1) Click on Enabled Apex Class Access > Edit and simply move Apex classes with Bria prefix to the "Enabled Apex Classes" section.
2) Similarly, move Visualforce pages (pages with Bria prefix) to the "Enabled Visualforce pages" section