How do I remove my USERNAME from the URL's

 I am not sure if I have understood your question correctly.

Do you want to change the URL of your form?

You can change it by following this guide: https://www.jotform.com/help/261-How-to-Create-a-Custom-URL-of-a-Form

oryou can also use custom domains to edit your url.

https://www.jotform.com/help/144-How-to-use-Custom-Domains-with-Jotform