How do I take out old shower to put better in

Go into the home store and your view should change so that it's from directly above the house, click the shower, and click the funny-looking button next to the check mark, that puts it in your inventory, next go into the home store and go into your inventory (the blue button) and go into the bathroom section. Click on the shower that you want, then move it by either holding it and dragging or by holding and dragging the arrow circle. I don't know what to call it, but it has an arrow pointing in each direction.