Iframe Into theme Footer

Hi Sakin, i´m trying to add a facebook custom Like box (Facebook Iframe) in the footer, between "Copyright and powered by", using Footer Editor Option. Specifically im trying to insert an Iframe from Facebook into footer. When I save it, wordpress theme code discard my iframe entirely. It just don´t save iframe codes in it. Do you know how do I insert it into footer (central clear area) my Iframe, in a way that some automated code doesn´t erase it? Thanks