First, we open Apple official website and click to buy an AirPods, as shown in the figure.

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As shown in the figure, we buy AirPods and provide lettering service for free. We click to add it to the shopping bag.

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After entering the shopping bag, you can see the addition behind the laser engraving. We click on it.

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In the pop-up window, we enter the words we want to carve in the input box, such as Baidu experience.

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As shown in the figure, after we enter the Baidu experience, the words Baidu experience appear on the AirPods box, and we can click Save.

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On the shopping bag page, our lettering appears under laser engraving. We can click checkout to complete the purchase.

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