Epson WorkForce ST-M3000 Monochrome MFP Supertank Printer - Manual (Page 194)

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You see a screen like this:
3. Select Contacts .
4. Select Add Entry .
5. Select Add Group .
You see a screen like this:
6. Select the registry number you want to use for the group you are adding.
7. Select the Group Name field, use the displayed keyboard to enter the group name (up to 30
characters), and select OK .