From the front page of your Seller Central account, click the gear icon.

Next to the user name, click "Manage Permissions"

Scroll down until you see "User Permissions" under Settings.

Once you give "User Permission" Edit access, that person can then give themselves the necessary permissions. By giving someone "User Permissions" this person has almost full control of your Seller Central account with a few exceptions such as deposit methods which can only be changed by the owner.

sellercentral.amazon.com

This guide provides step-by-step instructions on how to give someone "Super User" permission in Seller Central. By granting this level of access, the person will have almost full control of your Seller Central account, making it ideal for delegating tasks or managing your account in your absence.             ***CAUTION*** Only provide this access to someone you trust.