Canon imageCLASS MF6540 Basic Operation Manual page 126

6
Press [ ] or [
dialing code.
7
Press [Clear].
8
Repeat steps 6 and 7 until all recipients are deleted, then press [OK].
9
Press [Stop] to return to the standby mode.
When deleting all numbers, the registered name is cleared automatically.
] to display a one-touch speed dialing key or coded speed
4-25