Join a space
Click My Spaces on the Administration bar, then click the All Spaces tab to display all your spaces and ones whose Visibility is set to "Visible".
There are two cases to join a space:
The first instance: For spaces without validation required, click Request to join corresponding to your desired space. You will automatically become their members.
The second instance: For spaces with validation required, after clicking Request to join, you have to wait for the validation from the space's owner who can accept or deny your request.
Revoke your request
To revoke your request for joining a space that has not been validated by its owner, simply click Cancel.
Leave a space
To leave a space, simply click Leave.
If you are the only leader of that space, the message which informs that you cannot leave a space will appear as below.
Note
After you have left a space, the space will not exist in the My Spaces tab, but in the All Spaces tab (for the "visible" space only).