Is This Too Much To Ask? (Checkout Page)

@avantmedia :
You won't be able to get the registration form to display once you're already registered.
If you want the users to be able to edit their address information, you should add back the address view.

@G9Cap :
I'm going to look at it.

The data is not stored in the session but in the database.
You can see it in the table hikashop_address

It's not possible to edit your email address via HikaShop. Joomla might allow that (I don't think it does) if you're using a normal user account.

I'm not sure which mode you're using but if you're in "no registration" mode, you can use the code:
$app = JFactory::getApplication();
$app->setUserState( HIKASHOP_COMPONENT.'.user_id', 0);
To force the unset of the user data.
And thus you would see the user information field again once that code is run.
If you want to make it a button, that's possible by adding the HTML of your button in one of the view files of the view "checkout" via Display>Views which would redirect to the checkout with an additional parameter that you would then check to run that code and the do a redirect:
blog.calebnance.com/joomla-1.5/code/how-...5-mvc-component.html