I lost the right AirPod, how to add the AirPod to muy new regular iPhone 13?

Hi LilianaPineros31

Welcome to the Apple (user-to-user) Community.

Apple support have some articles online that may help you:

Re: I lost the right AirPod

How to: Find your lost AirPods - Apple Support

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Re: How to connect my other AirPod to the iPhone 13?

Discussion thread: How to connect you AirPods with only one … - Apple Community

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if Needed:

How to: Set up your replacement AirPods or charging case - Apple Support

or

How to reset your AirPods and AirPods Pro - Apple Support

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Other resources:

AirPods Support Website:

Find all the topics, resources, and contact options you need for your AirPods....

AirPods Support - Official Apple Support

And

 AirPods User Guide online:

AirPods User Guide – Apple Support

All the best :-)