facebook widget in footer

hello,

how can i change the facebook widget in fotter to our facebook page? i see the iframe code in the widgets panel, but i do not see where and how i can change thos to ours?
i have put a link in the theme options-social media, but that’s not it.

is it the tutorial of the social login that will solve this issue? How o i get the facebook app code of MY ccount and not the author’s that comes as the demo?

thanx!