How do I add products?

Hi guys,

just installed locally the gridmarket-theme 'cause it looks really cool.
What I've done so far is:
- copied the framemarket to wp-content/themes
- copied the grimdmarket from the framemarket-folder and paste it here: wp-content/themes
- chose the gridmarket theme in the backend and that works fine.

But i can't figuer out how to add products - not in a post or widget or ...
Can you give me a short advise to get it work?

Thx a lot,