On the page header, click Voice and Video. On this page click the "Add Voice Configuration" button (mouse over for description) to configure the common SIP server settings for all users with this account (eg. SIP domain or proxy server). Up to five SIP accounts can be configured.
Also on the top, click Team Members. On this page you can either invite new members of your Team, or modify existing members. Once a member is invited, clicking the member will open the member's configuration page. Here you can input the member's individual SIP settings like username and password. After adding or updating changes on the web portal, the respective user needs to log out of their Bria client and log back in for the changes to go through.