To add or edit a contact in your Outlook app address book, please follow the steps below:
Step 1:
Open Outlook. On the top ribbon, locate the Contacts area and click the Address Book button to expand the Contacts window.
Step 2:
From the top of the Address Book window, select the desired address book from the dropdown list.
Step 3:
Once selected, the contacts will appear in the left-hand pane of the Address Book window.
Once completed, the new or updated contact will be available for use when sending emails through the Outlook address book.