To use the Dynamic Overlays on the MakeMeReach platform, you'll need to be using a catalog. Which means that you are on the catalog sales objective or you are using a dynamic carousel in your campaign.
Once you're in the Campaign Creation flow, in the Creatives step, you'll find lower down in the page a couple of options:
The first option is to enable you to add info on products: it will add a small and colorful indication of the price for each product in your catalog, putting it on top of your picture (and taking the price you have put in your catalog automatically).
Among other things, you can choose the font, position and shape your price will be displayed as, you can also choose to display a strikethrough price, percentage off or free shipping depending on the set-up of your catalog:
The second option is enabling you to add a frame to your products, blending it in if you want to! It's a good way to add your logo to your pictures for instance.
You can try any option you want to, leading to results similar to this: