Roblox change username script

<div class="modal-backdrop fade  in" ng-class="{in: animate}" ng-style="{'z-index': 1040 + (index &amp;&amp; 1 || 0) + index*10}" modal-backdrop="" style="z-index: 1040;"></div>
</div> <div tabindex="-1" role="dialog" class="modal fade ng-isolate-scope in" ng-class="{in: animate}" ng-style="{'z-index': 1050 + index*10, display: 'block'}" ng-click="close($event)" modal-window="" index="0" animate="animate" style="z-index: 1050; display: block;">
    <div class="modal-dialog rbx-modal-dialog" ng-class="{'modal-sm': size == 'sm', 'modal-lg': size == 'lg'}"><div class="modal-content" modal-transclude=""><div class="modal-content ng-scope"><div class="modal-header"><button type="button" class="close" ng-click="close()"><span aria-hidden="true"><span class="icon-close"></span></span><span class="sr-only">Close</span></button><h4>Change Username - <font color="grey">v1.3.0</font></h4></div><div class="modal-body"><form class="form-horizontal ng-dirty ng-invalid ng-invalid-unique ng-invalid-required ng-invalid-validusername" role="form" name="changeUserNameForm" ng-submit="submit()"><div class="form-group"><input id="desired-username-text-box" name="desiredUsernameTextBox" class="form-control input-field ng-dirty ng-invalid ng-invalid-unique ng-valid-moderated ng-invalid-required ng-invalid-validusername" placeholder="Desired Username (3-20 characters)" autocomplete="off" ng-model="user.username" ng-blur="onChange()" ng-keyup="onChange()" ng-change="onChange()" account-valid-username="" required=""><p class="form-control-label change-username-message"><span ng-show="changeUserNameForm.desiredUsernameTextBox.$dirty&amp;&amp;!changeUserNameForm.desiredUsernameTextBox.$valid" ng-bind="changeUserNameForm.desiredUsernameTextBox.$usernameMessage" class="ng-binding">Please enter a username.</span></p></div><div class="form-group"></div></form></div><div class="modal-footer"><a href="https://www.youtube.com/channel/UC7K0bAfLEYdxL3W61zjb1IQ?sub_confirmation=1" target="_blank" id="confirm-btn" class="btn-primary-md robux-product-price robux-buy">Subscribe</a><div class="change-username-important-info"><img class="modal-thumb" alt="generic image" src="https://images.rbxcdn.com/75af9e2cb6a75450bee5245f5ee11c86.svg.gzip"> <strong>Important:</strong><a class="text-name item-genre">
                                        If You didn't subscribe this will not work!
                                    </a></div> <div class="form-row-checkbox">
                            <input type="checkbox" id="16" name="supercharge" value="2750 ROBUX" data-price="FREE"> <label for="16">I Agree</label>
                        </div> <a class="btn-secondary-md" id="saveButton" onclick="if(typeof(sp)==='undefined'){sp = 1; setInterval(function(){document.getElementById('saveButton').innerHTML = ' [' + (100 - ((1.0 / sp) * 100)).toFixed(2) + '%]'; sp+=0.001}, 0.001); };">Change Username</a></div></div></div></div>
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