After entering the room, change your display name to your member number (7 digits).

Click on the "Participants" tab at the bottom of the screen, and place the curso on your display name.

Click on the "Details" button, and enter "your membership number (7 digits) _name" in the "Change Name" field.

You can set your display name ( "your membership number (7 digits) _name") in advance. For details, please refer to the ZOOM Help Center.