ChangePassword option in Kapsel Logon Plugin

Dear All,

I am using Kapsel Logon Plugin in an Android application(Based on HTML5). Now I want to introduce the changePassword feature in this plugin. As mentioned in http://scn.sap.com/docs/DOC-49524 I have implemented the logon plugin and all is working fine. Now my question is how and where can I enable the "change your password" feature. Does this mean an additional button somewhere?

I already have the code given below, but I don't know how to implement the functionality in the logon plugin screen.

Code:

function changePassword() {

                sap.Logon.changePassword(successCallback,errorCallback);

            }

            function successCallback() {

                alert("Password successfully changed.");

            }

            var errorCallback = function(errorInfo){

                alert("Error while changing password: " + JSON.stringify(errorInfo));

            }

Thanks.