How do I customize a URL?

When someone visits my website and then click on a show to get more information and or sign up it has jotform.com at the top is that customizable? 

You can customize your form url and you can also use custom domains for your form.

Please refer to the following guides to now more:

https://www.jotform.com/help/261-How-to-Create-a-Custom-URL-of-a-Form

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

Hope this will help.

If you have any further query, please let us know.