1. Modify your own: open the group member settings in the upper right corner of the group chat-> Click "My nickname in this group" to modify it, as shown in the figure:

Confirm after modification.

2, modify others'.

Open the group member settings in the upper right corner of the group chat-> Click "all group members"->; Select the group member you want to modify, and then click the member to display the member's information. Select to set comments and labels, and then modify and confirm in the Remarks column.