Installation procedure arrow 3. Mail arrow 3.3 Your address book arrow 3.3.1 Modify your contacts
3.3.1 Modify your contacts

If you click with your mouse on one of the white areas, you can change the information it's contained there, the name or the email address.

If you want to save the changes you have just done, click on this image. You'll find it next to the contact you have just changed:


If you want to delete a contact from your address book, just click on this icon positioned next to the contact you want to delete: