You can list any unrevealed key, product, Groupees Coins, or bundle for trade or giveaway. An item can either be listed for trading or reserved for giveaways, but not both. You cannot list an item for tradeing or giveaways if it has already been traded out or given away.
Games, music, other products, and third party keys
To list a product for trading, locate the product on your purchases page and click on the trading button. If you want to unlist it, click on the trading button again. If you want to add the product to your giveaways tab, click on the giveaway button to add it. Click the button again to remove it. Please note products purchased prior to November 29, 2015 cannot be listed for trading or added for giveaways.
Keys
You can list individual keys trading. To list a key for trading, locate the key on your purchases page and click on the trading button. If you want to unlist it, click on the trading button again. If you want to add the key to your giveaways tab, click on the giveaway button to add it. Click the button again to remove it. Keys must be unrevealed or potentially revealed to be tradeable or given away. Please note that in the near future keys from products purchased at Groupees will no longer be individually tradeable. You can still manage existing keys individually.
Coins
You can list an unused coin from the coins tab on your purchases page. Click on the "Manage" button in the balance bar to see a list of coins you own. To list a coin for trading, locate the coin on the list and click on the trading button. If you want to unlist it, click on the trading button again. If you want to add the coin to your giveaways tab, click on the giveaway button to add it. Click the button again to remove it. If you list or use a coin for trading/giveaways, you cannot list the bundle it belongs to for trading/giveaways. Similarly, if you list the bundle for trading/giveaways, you cannot list or use the coin.
Bundles
To list a bundle for trading, locate the bundle on your purchases page, expand it, and click on the trading button in its header. If you want to unlist it, click on the trading button again. If you want to add the bundle to your giveaways tab, click on the giveaway button to add it. Click the button again to remove it. You will be unable to list a bundle if you have revealed or listed any of its constituent products or coins for trading or giveaways.
You can also unlist tradeable items from the trades site by going to the offers tab, locating the item you want to unlist and clicking on its "Revoke" button. Items set for giveaway can be unlisted by going to the "Giveaway" tab on your purchases page, locating the item, and clicking on its "Return" button.