You can remove someone from a group through the ‘Control Panel.’ Log into the control panel at net.brosix.com, click on the ‘Users’ option in the Dashboard and select the ‘Groups’ option. From here, select the ‘Members’ tab and click on the ‘Remove’ link on the left side of the screen in order to begin removing users.
Alternatively, you can remove users directly from their accounts by selecting the ‘User Accounts’ option in the Dashboard and selecting the name of the user you would like to remove. From their profile select the ‘Groups’ tab and select the ‘Remove’ option next to the relevant group name. You can find a more detailed step-by-step guide to group management here.