I would like to have mynxx at shop.mydomain.com and akiraka as my main domain, is there a way to connect the 2logins so that registered users only have to log in once?
If the shop and the main are both in Joomla.. why use a subdomain ?
What extension are you using for your shopping cart ?
you can assign a template in template manager to an extension.. so you could assign mynxx to the extension that runs your cart.. and leave akiraka as the default.
I assume it was with the Akiraka's Rocket Launcher.
Since you've just applied the template Mynxx template, you'll have to install and configure all the extensions as well.
Also note, since you've probably install with Akiraka's Rocket Launcher, it contains that sample data, not the sample data from the Mynxx demo.
If you want it to look 'just like the demo', you'll need to
A) install a fresh copy using the Mynxx Rocket Launcher install a fresh copy using the Mynxx Rocket Launcher on your local machine or a sub directory of your site and use the back end as a reference you copying and pasting the code.
Another Alternative is to install with the Mynxx Rocket Launcher and and add Akiraka's template and extensions.