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?
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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!