Summarize:

Click the gear-shaped icon in the top-right corner of the page to do so. A drop-down menu will appear. It's a link in the drop-down menu. Doing so opens a pop-up window. You may not need to scroll down to see this link. It's in the upper-left side of the window. You'll find this in the middle column of options. Click the "Add a sender here" text box at the top of the "Blocked senders" section, then type in the person's email address. This is to the right of the text box.
Open the "Settings" menu . Scroll down and click View all Outlook settings. Click the Mail tab. Click Junk email. Enter a contact's email address. Click Add.