Hi,
1. Panagea theme uses default wordpress login feature, so customers can not create password when registering.
2. You can edit /templates/template-login.php file. It is login page template.
3. Please use following code in bottom of /functions.php file to hide topbar.
show_admin_bar(false);
4. We can not recommend any plugin to show user information in menu.
5. Of course, you can use external plugin for login and register system. After you create login page with any other plugin, you should set login page in theme options panel.
6. Panagea theme uses default wordpress functionality, so you can not edit this email template.
7. You can check bookings in Tours -> Orders menu. http://prntscr.com/mw7zy9
Regards, C-Themes