To edit a contact:
Go to your Contacts area
Click on the name or details of the contact you wish to edit
Make the changes you wish to make
Click on Save and Close to come out of the edit
To delete a single contact:
Go to your Contacts area
Click on the name or details of the contact you wish to delete
Click Delete from the menu at the top
To delete multiple contacts:
Go to your Contacts area
Select the check boxes for each of the contacts you wish to delete
Click Delete from the menu at the top