1. Press the play button in the middle of the screen

2. If you cannot see the video, try to change the settings by clicking on the 360p in the bottom menu bar of the video, change it to 480p or 720p. If you see a flickering green screen: 1) Right click on youtube video and select the Settings. 2) Under Display, uncheck the 'Enable hardware acceleration' check box 3) Refresh

3. To make video larger, either click the middle of the video to watch at you tube or click on the 4 arrows button in the bottom right hand corner to make full screen.