UK here. Yes you order an appliance and it gets delivered, and in some cases installed, by the retailer. If you have a plumber or kitchen fitter maybe they will collect it for you in their van. I’m sure you could save a bit of money on shipping if you collected it yourself, but not many people have the means to do so. And this way, if it’s damaged in transit, the retailer are liable.

I’ve just done it. Tap explore in the bottom Tab bar. Under “feeds” you can switch to “subscribed” and if you use the 3 dots next to subscribed you can set it to default.