How to replace older flash menu with new HTML5 menu?
Open your page in SWIMBI, you will see that your navigation structure loaded in the app. Then select new menu and click "Publish".
Why I still see the register button?
After you click "Publish", the preview window appears. Make sure that in the top right corner you see your website domain name. If you don't, click on the name to change it. After you publish with correct domain name, don't forget to update menu files on your server.