Hello @georgelevy,
In order to change the URL name you can go to Admin Panel > Settings > General > Site Address (URL) and you can change to your desired URL name .
Also the theme deals with the design part only so it would not break the site even after changing the URL name .
Also note that the site URL registered with your purchase of the pro version must be updated with the new URL in your account for theme license activation and Updates.
Hope this helps.
If you have any issue further please let us know.
Best Regards!!