Adding to the top of this Reply to share how I got it working with help from timbl (who noted that my public folder wasn’t), TheodoraPetkova (who demonstrated how to change sharing on a resource):
In my case, the resource was my public folder. At some point, I must have inadvertently deleted “Everyone” from “Viewers” in Sharing for my public folder.
In addition to creating a “groups.ttl” file as suggested by timbl I had to create a “people.ttl” file. In both cases I had to ignore the “workspace” error message and specify “phraingck.solid.community/public/” above the “Start new sourceat this URI” button.
I’m now able to add groups and contacts within those groups.
This community rocks!
Gave that a go, but no luck. Now I’m running into the “make a new workspace” problem. More on that later.
I obtained a new POD from inrupt.net then played with a few apps per the excellent post by Don Tai:
https://dontai.com/wp/2018/10/01/playing-with-solids-pod-documentation/
Back to my POD at Solid.Community. Below are a few screenshots that I captured while trying to add a new group>
After going to my public folder:
(Note the absence of a green plus sign.)
After clicking the public home icon on the far right:
Now I have a green plus sign!
After clicking that green plus sign:
After clicking the “Make New Source” icon:
Note the message about workspaces.
Any other idea?
Thanks again for your help!