Manually Adding Quick Dials
Navigate the Contacts tab, click the address books dropdown at the top, and select Quick Dial:
Click the +/Add a quick dial icon:
Fill in the details for your quick dial. Enter the contact's name in the Display Name field, and their phone number or extension in the URI field. Optionally, you may also set a profile picture for the contact:
Click the green save button to add the quick dial:
Adding Quick Dials From Existing Contacts
Navigate the Contacts tab, click the address books dropdown at the top, and select either Office 365 or Company Directory.
Scroll (or search) to locate the contact you wish to make a quick dial and click on them:
On the user's details page, click the green pushpin icon:
Click the green Save button to add the contact as a quick dial:
The contact is now a quick dial:
Removing Quick Dials
Navigate the Contacts tab, click the address books dropdown at the top, and select Quick Dial:
Right-click on the quick dial you wish to remove and then left-click Delete:
Click the Yes button to complete removal of the quick dial. If the quick dial was added from an address book contact, the address book contact will remain in tact; only the quick dial entry will be removed.