How do I complain about a postal worker?

For online lodging of complaints and status update through website (Go to home page and click on Customer Complaints​ link, select option Register Your Complaint for lodging com​​plaint and select option Track your Complaint for knowing the position of the case.)

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What can I do about a bad mail carrier?

Start by calling your local PO and asking the Postmaster to call you back, or better, go there and speak to the Postmaster in person. Bring info about specific instances, as much as you can. Get other people along the route involved if possible, to replicate the complaints.