Required field?

Hello, i’m trying to add in the recaptcha in the sidebox,
the recaptcha itself works,
however people can still post the data without being required to fill in the reCaptcha.

Is there extra code that needs to be added in?
like an if requirement?
I also enabled the function to not load the submit button without the reCaptcha but this doesn’t work.

I added the code as proposed in the manual for the custom forms in wordpress.

The page I need help with: [log in to see the link]