Sharp B750 - UX B/W Inkjet Facsimile Operation Manual page 77

Rapid Key labels
Cut out each row of Rapid Key labels below and affix each row of labels
above the corresponding row of Rapid Keys with glue. The layout of the
Rapid Keys is shown on page 5. After you store a fax or phone number in
a Rapid Key, write the name of the destination on the label above the key.