Your database is preset with one standard 'Store' account which operates as a general account to enter transactions which are not recorded on a family account. You'll find it looks very similar to a family account (except for it only has a Summary and a Transaction tab). Display a listing of Store accounts by going to Store > Store Accounts.
Add additional Store accounts by going to Store > Add Store or by clicking the Add Store Button in Stores > Store Accounts. If you have multiple locations, you may want to create a store for each location. Enter the new store name, check if it's a duplicate, and select the location. After clicking Save, the full store account page opens so more details can be entered.
If you decide not to use a Store account, use the Pencil icon to make the store inactive, by changing the status, or delete the store using the Trash Can icon.