Sharp FO-DC535 - Manual (Page 160)

Broadcasting
158
Editing a group
If necessary, you can add numbers to or delete numbers from a group by
repeating the programming procedure for the Group Key. Select SET in Step
3 and select the Group Key in Step 5. Add or delete numbers as explained in
Step 8.
9
Press .
10
Return to Step 5 to program another Group Key, or press
repeatedly until you return to the date and time display.
START/
ENTER
STOP