It's self-evident, to tell you the truth. Have you tried? Just put in a search for your desired video, and select Save.

Your post would have more utility for others if you had titled it something like "How do you save YouTube video with biwifi?"

Or, rather than start a new thread, you could have kept things neater by staying with your earlier thread.

Please follow the great Fanoush's request: "Newbies click here before posting. Thanks."