A Carte Key is what unlocks Marketplace extensions and themes for your installation. To install an extension or theme, you'll need a Site (Carte) — create one from Sites in your TastyIgniter.com account menu. Anything you add to a Site installs automatically the next time you update your TastyIgniter installation.
To find and use your carte key:
Once your Site is created, find its carte key on the site details page in your Account section.
A typical Carte Key looks like this: a26cff52409bd000b0000b7000ae97bdceade86c.
Use it to bind a new or existing TastyIgniter installation to that Site.