You have to access it from a desktop or rotate your phone to landscape mode. Then click to expand the first « Delivery location » section at the topOkay...... I can't see where the pickup reference is on the web/app.
I chose Bluewater a while back after clearing the "Prepare for Delivery" section.
Next 2 options left are "Payment" and "Delivery" but I have no reference where ill be getting it from.