Add A Login Function To A Kodi Addon

I am looking for some help to add a login function to a kodi addon which checks a sql database for correct user/password. i have a test website with a signup/login section working and running from a sql database. I am looking to add this to a kodi addon to keep it private,so that only registered users from the website can use the addon. My test website for login/registration is here [login to view URL] the kodi addon template i want to use is attached and can also be found on github here. [login to view URL] the addon will be free addon for a private facebook group i am a member of. Lastly i have read this guide [login to view URL] but i cant seem to get this working. any help or information is very much appreciated.