Need Help With WHMCS Country Drop Down - Paying For Help

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i need help removing country drop down from whmcs i tried 
  <select id="country" name="country" class="form-control">

                                       <option value="US" selected="selected">United States</option>

                               </select>-->
                               <input type="hidden" name="country" value="US">

but it does not work please help, ill give u free off shore hosting