Hello, I'm trying to integrate XF into my login system (a web-application). XF looks pretty big & complex; can someone please give a step by step guide how I can: 1. When a user signs-up to my web-app, what do I need call/insert into XF tables to register the user signed up? Including setting the user's image. 2. When a user signs-in into my site; what do I need to call to register the user logged in on the forums? 3. Use the header and footer of my website; when I try and "include()" the forum index.php it redirects the browser. Thank you!