How do you edit the name saved in the Cloud Contact in Phone App?

How can I edit a contact details that are saved in Cloud Contact? I can see them in my Phone App but not in the website portal.   My Contracts saved in Personal Contacts does not show all of my contacts which were saved in my list of contact saved in App.  I have been saving the name as I received or called that person but found an error and would like to correct the name.  I can see the name and contact under Contacts in App but there seems to be no ability to edit.  The same list does not appear in the Personal Contact in the web portal.