www.geogebra.org/groups
www.geogebra.org/groups represents an easy way to join existing Groups:
Join
Easily join an existing Group using the corresponding Group Code. Just enter the Group Code on www.geogebra.org/groups and click Join in order to directly access the corresponding Group page.
Note: The Owner of a Group will provide the Group Code for you.
Create Group
Create your own Group and invite other users of the GeoGebra Community to become Members of your Group.
Go to my Groups
Log in to GeoGebra to have access to all the Groups that you have joined or created yourself.
Note: You can also see your GeoGebra Groups on your Profile Page on tab Groups.