I am not familiar with that specific tablet, but if you have the Youtube app, and it just will not open, uninstall it, restart your device, then re-install the app. A lot of times updates, either to the app itself, the tablet software, or Android, can create slight incompatibilities in an app. A simple uninstall/re-install will often fix it. How to uninstall depends on your current software. On some of my Android devices I can press and hold the app icon which will open a little "App info" balloon. Tap it, and you will have an uninstall option. Otherwise you may need to go into Settings. If your Settings screen has tabs across the top, choose General. Look for something like Applications or App Info. Open that and scroll down to the app, tap it, and you will have an option to uninstall.