How To Tighten Handlebars On A Bmx How Do I Make My Handlebars Stop Moving On My Bike?

How do i make my handlebars stop moving on my bike? - how to tighten handlebars on a bmx

It is a BMX bike. The screws and pull all the way and nothing seems to strip. But if I want to ride my bicycle is pushed back as they were, and I want to relax and go on again. Suggestions on what to do?