It’s really simple!
Once you've downloaded the Flashfood app, and create your account you can start browsing deals near you right away.
You buy items directly from your phone, and head over to the store any time of the day to pick up your order. Your items will be located in the Flashfood zone (it's usually near the customer service desk). Check with the customer service in-store on how to pick up your order as each store has its own process to ensure that you get what you ordered.
Once you've picked your items or the store associate has handed them to you, they will mark the order as picked up to clear it from your pickup tab. And voila you're done!