The current Administrator on the account will need to be the person to do this. Teh Administrator just needs to log in, go to their profile page, and click the "Change Permission Level" link. This will prompt them to select the new Administrator from a list of users at your company, and select the location(s) where they will now be granted Manager permissions. Upon clicking the "Change Administrator" button, that's it! The new Administrator gets an email notification of the change, and will now have a SETTINGS module the next time they log in, where they can manage the company's settings. Pretty simple!
If your Administrator no longer works for your company and they're unavailable to do this, please contact us at firstname.lastname@example.org. We can help!