How to fix loose handlebars on a bike

This is my daughter in law’s bike. She got the handlebars loose from using it too much. What you gotta do is twist it so it's straight. THen you use an allen wrench most of the bikes have the screw under the handlebars.You just have to tighten it. Sometimes you have to make a face to become more powerful. I also fixed the light because it was a bit loose too. Also, I show you how the old bike has the rim all twisted but it still works. I still have to order the part for it but will do that later. Meanwhile my son doesn’t care and he uses it like that. It turns but it gets stuck because there is a crack on it, as I showed you on the video, It’s all bent but it's been working, nothing to worry about. You do what you can with what you got.