Adding Group name to already created Group text.
It doesn’t appear that you can do this if you weren’t the original creator of the group text. Is that correct?
Hello LJM-Sr!
You cannot change the name of a SMS/MMS Group.
You can change the name of an iMessage group. Anyone in the group can change the name.
The Related Article above your name has more details.
I hope this is helpful. Good Luck!