How can I change this once clicked submit button it “Post” and redirect to thank you page?

How can I change this once clicked submit button it “Post” and redirect to thank you page? I’m new to this and I’m stock and need your help. Thank you.

<div class="row" data-ar-id="knPGryb10X">
        
        <div class="col-md-10 col-lg-8 col-xl-7 mx-auto" data-ar-id="2a8BIf57NA">
          
        <form method="POST" action="https://storage/projects/1/ohPw14Bn7yEqk8K3BHmUfj4LDUw7PwlweOou/default-form-handler" class="" data-ar-id="72Xz7Iimkn">
    <div class="control-group" data-ar-id="46igvgmRN2">
      <div class="form-group floating-label-form-group controls mb-0 pb-2" data-ar-id="CNJEStnEZk">
        
        
      </div>
    </div>
    <div class="control-group" data-ar-id="RBHvtUd4UV">
      <div class="form-group floating-label-form-group controls mb-0 pb-2" data-ar-id="2JsYZhLtPe">
        <label data-ar-id="p3n77pazVO">Email Address</label>
        <input class="form-control" id="email" name="email" type="email" placeholder="Email Address" required="required" data-validation-required-message="Please enter your email address." data-ar-id="bKETslityp">
      </div>
    </div>
    <div class="control-group" data-ar-id="3E9itexHyL">
      
    </div>
    <div class="control-group" data-ar-id="r3Tt4ulNfM">
      <div class="form-group floating-label-form-group controls mb-0 pb-2" data-ar-id="llWK5VUTQp">
        
        
      </div>
    </div>
    <div class="form-group" data-ar-id="gg7EinsWzs"><button class="btn btn-primary btn-xl" type="submit" data-ar-id="GmTydIJXpg">Send</button></div>
  </form></div>
      </div>