Edit a contact on iCloud.com
You can edit a contact at any time. You can add or delete fields for default information such as phone numbers and email addresses, and you can add fields for additional information such as a birthday, nickname, spouse’s name and so on.
In Contacts on iCloud.com, select a contact, then tap Edit at the top of the contact card.
Do any of the following:
Update existing information: select the text in any field and enter new text.
Add new information: enter the information in a blank field.
Add a new text field: tap the Add Field pop-up menu at the bottom of the contact card, then choose a type of field.
Add another address: tap Add New Address below the address fields.
Delete a field: tap the Remove button to the left of the field.
Change a field’s label: tap the arrow to the right of the label, then choose a label from the menu.