If you would like to go back and work within a Group you have created previously, from the Home page scroll down to Image Groups and click. The system defaults to the list of Institutional Groups, so click on Private if the Group you are looking for has not been made accessible. From the list of Group titles click on the one you want and it will open.
From here go up to Organize, then choose Edit Group Info.
If you start at Image Groups, either from the Home page or from the Browse tab, you will see a screen like this:
It shows the categories of Groups available. It is aso the screen where you can access a search box for searching within Groups. If for instance you want students to see all your Groups, or a student wants to see all Groups on a certain topic, this is the place to begin. Click on search and Type in a title or tag. This is why specific and consistent tagging is important, if you want to draw a number of results from one search.