I want to add capcha to Mobirise builder's form. When I'm adding the code below, formd doesn't send any messages after that.
What should I do? May be someone have solved this issue.

  <head> <script src="https://www.google.com/reCAPTCHA/api.js" async defer></script> </head> 
  <body> <form action="?" method="POST"> 
  <div class="g-reCAPTCHA" data-sitekey="your_site_key"></div> 
  <br/> 
  <input type="submit" value="Submit"> </form>