my website contact submit button dosenot work. please help me im a noob

My website is
https://account-security.ga

at the end there is a submit button which dose not work, I use a free them from nice page tell me how I can fix it please.

 <section class="u-align-left u-clearfix u-image u-section-5" id="sec-a4d9" data-image-width="150" data-image-height="99"></section>
<section class="u-black u-clearfix u-section-6" id="sec-5ffa">
  <div class="u-clearfix u-sheet u-sheet-1">
    <img src="/images/Untitled12.png" alt="" class="u-image u-image-default u-image-1" data-image-width="158" data-image-height="1162">
    <div class="u-clearfix u-expanded-width u-layout-wrap u-layout-wrap-1">
      <div class="u-layout">
        <div class="u-layout-row">
          <div class="u-container-style u-layout-cell u-left-cell u-size-30 u-layout-cell-1">
            <div class="u-container-layout">
              <div class="u-form u-form-1">
                <form action="#" method="POST" class="u-block-ef8d-8 u-clearfix u-form-spacing-15 u-form-vertical u-inner-form" source="custom"><!-- hidden inputs for siteId and pageId -->
                  <div class="u-form-group u-form-name">
                    <label for="name-4abe" class="u-form-control-hidden u-label">Name</label>
                    <input type="text" placeholder="Enter your Name" id="name-4abe" name="name" class="u-border-1 u-border-white u-input u-input-rectangle" required="">
                  </div><!-- always visible -->
                  <div class="u-form-email u-form-group">
                    <label for="email-4abe" class="u-form-control-hidden u-label">Email</label>
                    <input type="email" placeholder="Enter a valid email address" id="email-4abe" name="email" class="u-border-1 u-border-white u-input u-input-rectangle" required="">
                  </div>
                  <div class="u-form-group u-form-message">
                    <label for="message-4abe" class="u-form-control-hidden u-label">Message</label>
                    <textarea placeholder="Enter your message" rows="4" cols="50" id="message-4abe" name="message" class="u-border-1 u-border-white u-input u-input-rectangle" required=""></textarea>
                  </div>
                  <div class="u-form-group u-form-submit">
                    <a href=" " class="u-btn u-btn-submit u-button-style u-palette-1-base u-btn-1">submit</a>
                    <input type="submit" value="submit" class="u-form-control-hidden">
                  </div>
                  <div class="u-form-send-message u-form-send-success"> Thank you! Your message has been sent. </div>
                  <div class="u-form-send-error u-form-send-message"> Unable to send your message. Please fix errors then try again. </div>
                  <input type="hidden" value="" name="recaptchaResponse">
                </form>
              </div>
            </div>
          </div>

this is the code please tell m what i should do from here