How do you KFB loop?

How do you " knit in front and back loop"??? Im making this mitten pattern to complete a christmas set for my sister, and I can “Translate” all the pattern directions except for this…

http://www.knittingatknoon.com/mittenpatt.html

Thanks ladies as always!

Go here and go down to the video for `bar inc’ which is kfb
http://www.knittinghelp.com/knitting/basic_techniques/increase.php
or here - http://www.knittinghelp.com/knitting/abbreviations_explained/ and go k1 f&b/kfb.

sue