There are two ways to add a product to a client's bill:

If you are checking our a walk-in retail product, click the 'Sale/Retail Sale' button at the top of the calendar:

Alternatively, if you are adding a retail product to a client's booking, click on their booking then 'Checkout':

With checkout open, click 'Add Retail Product'

And find the product you are selling:

Once selected, you can adjust the quantity, staff member, price and discount information:

Before checking out any products, please make sure you have added retail prices for your items. This can be done when you add new products or in 'Stock Management'
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Remember, you can keep track of stock that has been sold and used in Menu - Stock Management