There are two options for having your Facebook store synced with your web store:
1. Automatically - using any of our premium plans would have your store synced automatically (starting at $9.99/ month; coming with 14 days of free trial).
2. Manually - log into your StoreYa.com back office and browse to your Manage Store > manage products tab where you can edit/ remove any item.
(If you can't see a specific product while being on that tab, please make sure you choose 'all products' in the top drop down list of that tab).