Creating a Yahoo Store
(If you have already connected your Yahoo store but it has stopped fetching new orders, go to the Troubleshooting section and look under "Fetching")
You can create a Yahoo store by using the New Store wizard:
On the Home Tab, click the New Store link.
Select the Shopping Cart (Yahoo) form the drop-down list of support carts
Follow the wizard to define and set up your store for that cart
Note: You can have multiple stores for any given cart or across supported carts.
The screenshots below show the wizard steps.
Step 1
Step 2