Can I change the URL of my form?

instead of jotform.com/form/123456789  change to jotform.com/form/MyForm

You can change the URL to a more readable form using the form embedding wizard

The form URL will be created in the following format

 jotform.com/{username}/{custom name}

If you want an approach without the username in the URL you can consider checking out this guide regarding custom domains for your form

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