You can use your accumulated Likes both in-store and online, it's very easy! In store, simply indicate this at the cash desk.
When shopping online, you'll see the amount you can deduct for your accumulated Likes at checkout. If you prefer to redeem them for experiences, go to your Mango likes you space and choose the one you like best.
Remember, to be able to apply your Mango Likes You discount, you need at least 1000 Likes.