edit initial comment for icloud shared album
When I created a Photos "Shared Album", it let me type in a comment. So, I wrote in some of the people. I by mistake wrote So-and-so's niece, but it was their grandchild. How can I edit this initial comment?
I do not want to delete the album and start all over. It's already gone out to people I shared with. Some have gotten the message, some haven't. Some people, but not all, have already "joined".
MacBook Pro Retina