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 click 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: Click the Add Field pop-up menu at the bottom of the contact card, then choose a type of field.
Add another address: Click Add New Address below the address fields.
Delete a field: Click the Remove button to the left of the field.
Change a field’s label: Click the arrow to the right of the label, then choose a label from the menu.
Create a new label: Click the arrow to the right of the label, choose Custom from the menu, type a name, then press Return or Enter.