In Skype for Business, you can add people to your Contacts list so they’ll be just a click away. If you want to add a new phone number to your contacts list, you will have to create a new contact. Skype's latest version on Mac(Skype 8) doesn't allow you to edit a contact's phone number since this information is set up on your contact's end. Enter Skype username of a person you want to add in the search field. Click a button with the picture of a person and a plus sign Add a Contact Not in My Organization Skype.
Open Skype For Business application and switch to Contacts view. Skype for Business on Windows Skype for Business on Mac OS Skype for Business on Windows.