Angularjs multi select dropdown in bootstrap modal

I'm an Angularjs newbie so I'm sorry for this question firstly.

I'm using Angular bootstrap modal from: https://angular-ui.github.io/bootstrap/

and multi select dropdown list from: https://codepen.io/long2know/pen/PqLRyZ

I don't know how to use them together.

I had a module and controller:

var app = angular.module("opsApp", ["$jsOps", "ngAnimate", "ngSanitize", "ui.bootstrap"]);
app.controller("OpsLayoutController", function ($uibModal, $log, $document, $scope, $http, jsPlumbService) {
this.renderParams = {
        view: {
            processes: {
                "default": {
                    template: "process",
                    events: {
                        tap: function (params) {
                            var modalInstance = $uibModal.open({
                                animation: $scope.animationsEnabled,
                                ariaLabelledBy: "modal-title",
                                ariaDescribedBy: "modal-body",
                                templateUrl: "editNodeModal.html",
                                controller: "ProcessModalInstanceCtrl",
                                controllerAs: "$ctrlProcess",
                                size: "lg",
                                appendTo: undefined,
                                resolve: {
                                    process: function () {
                                        return params.process.data;
                                    }
                                }
                            });

                            modalInstance.result.then(function (process) {

                            }, function () {
                                $log.info("Modal dismissed at: " + new Date());
                            });
                        }
                    }
                }
            }
}
app.controller("ProcessModalInstanceCtrl", function ($uibModalInstance, process) {

    $ctrlProcess.process= process;

    $ctrlProcess.ok = function () {
        $uibModalInstance.close(process);
    };

    $ctrlProcess.cancel = function () {
        $uibModalInstance.dismiss("cancel");
    };
});

That means I click(tap) the element then open the modal. This is not all of my code.

Can anyone suggest me how to use the dropdown list in modal.

Thanks you so much.