We can run ads for our products, we just can’t add A+ content to listings or make other changes to listings if we don’t have Brand Registry credentials (which 99% of the time we don’t unless it’s your own brand or you are working with the brand). Go to the hamburger menu at the top left of your seller central. You will find “Advertising” in the drop down menu. There you can set up a campaign for one or more of your products. There are a lot of choices but you can set up a cheap strategy by putting limits on your daily spend and the amount per click (the “2 cent ad strategy” since 2 cents is the lowest allowed bid). You can bid more for better placement of your sponsored ad – but this can add up in a hurry.