To add a shop to Influencer you will need the following plugins:

WooCommerce

Genesis Connect for WooCommerce

When you install WooCommerce you will be prompted to run a setup wizard.  It is important for you to allow the plugin to run this.  If it does not install the necessary pages, it sometimes creates a conflict that hides your other post & page content.

You can read more about the specific set up for WooCommerce here.

Once you have your shop installed you can create products by navigating to Products  > Add Product