Epson EcoTank Pro ET-5150 Wireless All-in-One Supertank Printer - Manual (Page 234)

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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 .