You will need to follow the instructions in your email. I can see you have done that, but you still have not configured the language selector to work with Enterprise version. You need to turn Enterprise option on from GTranslate module settings.
Please find my answers below:
# Account settings
You need to use the email/password when editing translations. For example if you want to edit English version of your front page you need to go to http://en.klockanett.se/
and add ?language_edit=1 in the end of the URL which will open the edit interface.
# Detecting selected language
You do not need to do anything about this unless you need to know which language is currently selected.
# Removing non-www to www redirect for our network
Currently you are not redirecting klockanett.se to http://www.klockanett.se
, so you do not need to do anything, as detailed in the instructions email.
# Enable JSON format translation
It is being used while your website uses AJAX communication in JSON format to load content on the fly. If you have communications like that let me know to check it for you.
# the last one
It seems that all your shop content is being loaded from ecwid website and misses your klockanett.se. You will need to talk to the Ecwid joomla extension developer to learn if there is an option to serve the shop content from your website.