打开手机淘宝，在订单详情页面点击投诉商家即可。投诉卖家的具体操作步骤为：

1、打开手机淘宝，在我的页面中找到并点击查看全部订单。

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2、进入全部订单页面，点击要投诉的订单商家。

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3、进入订单详情页，点击下方的投诉卖家。

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4、选择投诉类型。

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5、填写投诉信息，然后提交等审核即可。

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注意事项：

1、根据步骤操作，否则容易导致不成功。

2、如果卖家与卖家协商不一致，买家可以找淘小二进行投诉卖家，但是不能恶意投诉，发现是恶意投诉对买家的信誉也不好。