If you look at the picture you posted, the handlebars are at the far right ... and are help to the stem (the main piece in the photo) by what looks like a plate facing forward with two or three or four bolts (looks like one top center and at least one underneath.) Those would be what you loosen a little to move the bars.

All that will do is allow you to angle the bars back or forward a little , pivoting around the center mount. if you want to do other things with handlebars, you will need to watch more videos.