Starting December 12th, Steam Trading will require that your account has had Steam Guard enabled for at least 15 days before you can trade items. You already have Steam Guard enabled, so no action is required on your part

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Starting December 12th, Steam Trading will require that your account has had Steam Guard enabled for at least 15 days before you can trade items. You already have Steam Guard enabled, so no action is required on your part
从12月12日开始，能在Steam上进行交易的账号必须要开启Steam账户保护至少15天。你已经开启了Steam账户保护，所以你无需进行任何操作。