Hi,
1. You could create a menu item of the type "HikaShop checkout" via the Joomla menu manager, or you could enable the HikaShop cart module via the Joomla modules manager in order to see a cart module with a "proceed to checkout" button, or you could also configure the "HikaShop cart notification" plugin via the Joomla plugins manager in order to use a popup notification, which will have a "proceed to checkout" button too.
2. What do you want to happen ? You have the registration form, you fill it and validate it, and then it says that you're registered.
If you want to add text there, you can edit the file "after_register" via the menu Display>Views. You can add the HTML you want, a link to go somewhere else, some redirect to go automatically somewhere else, etc.
www.hikashop.com/forum/checkout/886204-r...er-registration.html