Need help with "KFB" for wine gift bag

I am hoping to knit the Wine Gift Bag from One-Skein Wonders and the pattern has “kfb”, which is defined as “knit into the front, then the back of 1 stitch”. Anyone know how to do this and is willing to explain how it works exactly?
Thanks for the help!

KFB is a common increase and is also called a “bar increase”. You knit into the stitch normally, but don’t take it off the needle. The reach the needle around and knit into the back of the stitch.

You can see a video of how to do it on this page.