If you want to order the same product again, this is what you need to do:
Open the shop tab in your app and tap "My Orders"
Click the "Reorder" button on the product you want to reorder, if you want to reorder multiple products, repeat step 1+2
They will be added to the shopping cart but you can still edit them or select a different quantity by tapping on the 3 dots beside the article
This could also be useful when you have already ordered a product and can't wait for it to arrive: you can simply click on Edit and take a look at your product again while dreaming of finally having it in your hands 😉