HTC One M8 for Windows - Manual (Page 92)

4. Edit or add new information for the contact.
After entering new information for an item, remember to tap to
apply the changes.
Deleting a contact
§ Deleting a contact may delete the contact information from both
your phone and from the online service where it's stored.
§ You may not be able to delete contacts from your social network
accounts.
1. In the contacts list, press and hold the contact you want to delete.
2. Tap delete.
3. If the contact is a linked contact (someone with multiple accounts),
choose which account to remove the contact from.
92 People