Log in to your Bria Cloud configuration panel and follow the below settings:

Service Label - Enter a descriptive name, like the user's name or service name
Domain - Enter your @Hosted domain name. You can get this from here:

Port - 5060
SIP Username - Enter your extension number
Authorization Username - Leave blank
SIP/Voice Password - Enter the password of the extension used
Call Display - Leave blank
Once that is completed, click on the Service Settings tab.

SIP Proxy - enter the same domain name as you did in the earlier step
Register with domain and receive calls - Check this box
Transport - Select UDP
You can leave the rest on its default value.
You may need to log out and re-login back to your Bria app for the changes to take into effect.