How do I use the furniture store?

This is the name of the store.
You can preview what My Room items look like with or without avatars in them with this button.
Here you can see how big the item is compared to your avatar.
This button buys the selected item. You can also see the price of the item underneath.
This shows you the number of colour slots the item has.
This shows you how many of the item you already own.
This shows how many coins and diamonds you currently have.
This lets you switch between wall and floor items.