If you are talking about the application for iPod/iPad, then you have to complete some goals before you can delete/sell items. You go onto build/buy mode and press the object you want to delete/sell. You press the red icon with a simoleon ($ a bit like this) sign in it, and it is deleted. You get half of the money it was worth when you sell it, which is the only real downside.
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Go to a Poke Mart, select "Sell," and sell the items that you want to sell. Note, however, that there are items that you cannot sell such as key items.
If you mean put new wallpaper in your house, go to move/sell items and click on the wall. If you mean buy new wallpaper, I'm supposing it's in the sims store.
1. There is no way to make items free on Roblox 2. You need a Builders Club membership to sell items
The easiest way to get money on ourWorld is to sell rare items on the Marketplace. Some items sell for up to 1,000,000 coins! However, only residents can sell on the Marketplace. For tourists, the best way to gain coins is to play games and sell items!!! To learn more on ourWorld then visit this site: -- http://ourWorld-Guide.com
go to any shop (including online store) and prees what you want to sell twice and you have now sold that item you can also sell stuff at the department store near the chopper garage/ boroken down bus.