This is a PLAYLIST. You can let the videos play in order, or you can choose the videos you want to see by pressing the youtube PLAYLIST BUTTON. You can also use ‘Next’, ‘Previous’ buttons which are near the Play button.
▼▼ PLAYLIST BUTTON ◄
..BACK ▲│▲ NEXT . . . . . . . . . . . . . . . . . . . . . . . . . PLAYLIST BUTTON ▲▲│…..scroll▲
Source: armpowernet