Canon L90 - Manual (Page 84)

3-15
Sending Documents
10
Press [ ] repeatedly to go to the digit you want to change, then press [Clear]
to delete it.
11
Enter a new subaddress with the numeric keys, then press [OK].
12
Press [ ] repeatedly to go to the digit you want to change, then press [Clear]
to delete it.
13
Enter a new password with the numeric keys, then press [OK].
14
Press [Stop/Reset] to return to the standby mode.