How to use Different Button in bootstrap Form

i have used Bootstrap and created form.my form Looks like

  <form action="default_results.php"   method="post" class="calculator"  name="frmCalculator">  

i have put this code begin of the code and end of the page i have used three button Looks like

                            <button id="button2" class="dont-compare shadow-inset" value="reset" >
                                    Reset</button>
                            <button id="button3" data-toggle="pop" class="dont-compare shadow-inset" class="update" >
                                    Update MI</button>
                            <button id="Button4"  class="dont-compare shadow-inset" class="calculator" >
                                    Calculate Scenarios</button>
                        </div>

i have another page its called default_ results.php page. i want load that page when i click Calculate Scenarios button . i used href tag that button. but that three button also load default_results page. how to set particular button? please any idea about it?