Rottys

Hi all: Purchased a 2012 a while back, and they only had 1 key, now do I have to take it to the dealer to get a new 1 to get it made and programed or can I get one like this http://www.keyless-remotes.com/remote-head-keyless-entry-remote-key-fob-for-ford-4-button-with-trunk/ TY