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<html ng-app="myApp">
<body ng-controller="userCtrl">
    <div class="centerForm">

        <form>
          <div class="form-group">
            <label for="exampleInputUser">Username</label>
            <input type="username" ng-model="userName" class="form-control" id="exampleInputUser" placeholder="username">
          </div>
          <div class="form-group">
            <label for="exampleInputPassword1">Password</label>
            <input type="password" ng-model="userPassword" class="form-control" id="exampleInputPassword1" placeholder="Password">
          </div>
          <table class="nav" align="center">
            <tr>
                <td>
                    <p><button type="submit" class="btn btn-primary" ng-click="saveUser()">Submit</button>
                    <a href="#" class="btn btn-info" role="button">Sign Up</a></p>
                </td>
            </tr>
          </table>
        </form>

    </div>
</body>
</html>

<script>
             angular.module('myApp', [])
             .controller('userCtrl', function($scope) {
                $scope.userName ="";
                $scope.userPassword="";

                $scope.myData = new Firebase( "https://myfirebaseapp.firebaseio.com/")

                $scope.saveUser = function() {
                    $scope.myData.push({userName: $scope.userName});
                };

                });


    </script>

<html ng-app="myApp">
<body ng-controller="userCtrl">
    <div class="centerForm">

        <form>
          <div class="form-group">
            <label for="exampleInputUser1">Username</label>
            <input type="username" ng-model="userName" class="form-control" id="exampleInputUser1" placeholder="username">
          </div>
          <div class="form-group">
            <label for="exampleInputPassword1">Password</label>
            <input type="password" ng-model="userPassword" class="form-control" id="exampleInputPassword1" placeholder="Password">
          </div>
          <table class="nav" align="center">
            <tr>
                <td>
                    <p><button type="submit" class="btn btn-primary" ng-click="loginUser()">Submit</button>
                    <a href="#" class="btn btn-info" role="button">Sign Up</a></p>
                </td>
            </tr>
          </table>
        </form>

    </div>
</body>
</html>