“次日达”是快捷的优先配送选项，仅向达到较高配送绩效标准的卖家提供。

注册“次日达”后，系统不会自动为您的商品提供次日达服务。您仍必须达到“次日达”要求。

如果您有资格提供次日达配送服务，请按照以下步骤操作进行设置：

1. 从设置下拉菜单中，选择配送设置。
2. 选择要注册“次日达”的配送模板，然后点击最右侧的编辑模板按钮。
3. 对于非 Prime 模板，选中“次日达”复选框，然后点击添加新地区以添加您的次日达地区。
4. 对于 Prime 模板，点击编辑 Prime 地区，转至“次日达”选项卡并选择您的次日达地区。
5. 选择地区后，您可以在“次日达”部分输入您的运费，然后点击确认。

 亚马逊官网原文详情：

Enroll in One-Day Delivery

One-Day Delivery is a fast premium shipping option that is only available to sellers who meet high delivery performance standards.

Enrolling in One-Day Delivery does not automatically offer your products for One-Day Delivery. You still must meet the Requirements for One-Day Delivery.

If you are eligible to offer One-Day Delivery, follow these steps to set it up:

1. From the Settings drop-down menu, select Shipping Settings.
2. Select a shipping template you would like to enroll in One-Day Delivery, click the Edit Template button on the far right.
3. For a non-Prime template, check One-Day Delivery checkbox, and click Add New Region to add your One-Day Delivery regions.
4. For a Prime template, click Edit Prime Regions, go to One-Day Delivery tab and select your One-Day Delivery regions.
5. After you select regions, you can enter your shipping rates in the One-Day Delivery section, and then click Confirm.

 文章来源：亚马逊官方网站