ShoreTel 530 User Manual page 30

NOTE When in alphabet mode, press the appropriate key on the dial pad
multiple times to scroll through the alphabet letters associated
with that key. Example: For the letter 'C' you would press the #2
digit three times on the dial pad.
Step 9
Step 10
30
longer than five characters that will remind you of the new
function of the custom button.
Press the Done soft key.
Press the Done soft key again to store your changes.