Hi,
You need to read the information on licensing. Depending on whether you qualify for a free license, if you do, then you need to register, apply for the free license, and on every page on which the menu appears you are required to leave the copyright information intact and to have a specific link back to Milonic, that is the 'cost' of getting it free, a link back on the pages which use the menu.
Licensing Information
Free Licenses THis explains in detail about who qualifies for free license and what you must do, if you qualify in order to remove the Milonic link from the menu. That is part of the programming, it's not in the menu data file and there's no way to remove it except by following the directions under the free license information.
Ruth