Delete a contact on iCloud.com
You can delete a contact completely from iCloud Contacts or remove it from a group.
In Contacts on iCloud.com, do either of the following:
Delete a contact completely: select the contact in the All Contacts list, press the Delete key, then click Delete.
Delete a contact from a group: click the group on the left, select the contact, then press the Delete key.
Deleting a contact from a group removes it from that group only.