Canon MF7280 - ImageCLASS B/W Laser Facsimile Manual page 184

Press the alphanumeric keys (e.g., [ABC]) to display the individual keys for each
letter or number. You can select a letter or number to restrict the displayed range
of entries. Press [All] to return to the full address list.
If the desired destination is not displayed, press [▼] or [▲] to scroll to the desired
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destination.
You can restrict the type of destinations displayed in the results list by pressing
the Type drop-down list.
If you select [All] in the Address Book drop-down list, the destinations stored in
the one-touch buttons are displayed. However, you cannot edit these
destinations. For instructions on storing and editing one-touch buttons, see
"Storing/Editing One-Touch Buttons," on p. 5-24.
The current settings for the selected destination appear.
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Edit the address details ➞ press [OK].
You cannot change a destination registered as a group address.
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Editing Address Details