Ninja form not working

Hi guys,
Can anyone help please?
I have created a Ninja form for my clients’ website at
https://cromptonbailey.co.uk/

Nothing happens when i click on submit.
I’m not a Developer, I’m a Designer so when it comes to tweaking JQuery or php etc I’m stumped.

Thanks an advance.

https://www.ads-software.com/plugins/ninja-forms/