I can see the stream but the image is fuzzy/soft, how do I make it look better?

YouTube guesses at the best resolution for the device you are using, if you the video is low in quality you can try a higher resolution.  On a computer click the symbol that looks like a gear in the lower right of the viewer.  On mobile devices it can vary, look for three dots in row and click them, somewhere you can pick a different resolution try 720p or 1080p.  Slow internet and/or device can also be the cause of a low quality stream.