On an Android device, this tab is called the "Membership" tab, on an Apple device this is the "Trading Room" tab.
Tap on the "Membership" tab at the bottom of the screen to show your currently active memberships.
Tab on any active membership to enter the live room and see the live room tabs.
Mobile App - App Tabs
Mobile App - Alerts Tab
Mobile App - Home Tab
Mobile App - Classes tab
Mobile App - Menu Tab
Mobile App - Live Room