Select Organisation and Room to Enter
If you are a member of multiple organisations and rooms, you first need to go to the correct organisation page before you can enter the rooms in that organisation.
The circled organisation displayed on the leftmost of the screen shows the organisation whose page and rooms you are currently viewing. Ensure that you are currently in the correct organisation.
In the left panel, you can now see the list of all the rooms that you have been added to in this organisation. Click on the name of the room you wish to enter.
Click Work with others to enter a collaboration session with others.