Welcome to the forum. Unfortunately only the movie pass can be watched on YouView boxes , not entertainment, kids or sports.
Have a look at the following list of supported devices as you might find you already have something that you can watch entertainment on. If not, a NOW TV box is probably your cheapest option.
If you do have another compatible device such as a games console, Roku, Chromecast etc that you want to set up, you can find more details here