Step 1:

From your mailbox screen, CLICK Options button and the More Options selection on the drop-down menu

Step 2:

CLICK the Safe and blocked senders link in the Junk e-mail section

Step 3:

CLICK the Safe senders link in the Safe and blocked senders section

Step 4:

Type or copy and paste the address in the area provided and click the Add to list button

Finished!

Messages from this sender will now be delivered straight to your inbox.