Hi Eva, please carefully read the thread 🙂
We have updated legenda ONLY on our staging enviroment before upgrading it on the live site. You see the cart working because you are navigating on the live version.
To access the staging enviroment you need to change your host file for the domain fonsvinum.com by adding this line in it:
fonsvinum.com 81.201.5.181
Once you save the file, when you’ll type fonsvinum.com in the browser bar, you’ll be automatically taken to the staging server.
That’s also the reason why you’re not able to login (the 8theme user exists only on the staging server)
best