Legacy Licenses (perpetual licenses purchased through Pixologic) will continue to be managed by the ZBrush ID and My Licenses systems. You will not start using the Maxon App until such time as you might purchase an upgrade or switch to a subscription. You will, however, need a Maxon ID to submit support tickets.
The ZBrush ID (formerly Pixologic ID) is managed through this URL:
Use the page to create your ZBrush ID as well as to update your details.
Please note that a Maxon ID has also been created for you, for use with My.Maxon.net and Maxon support. If you have not previously logged into one of those systems, you will need to do a password reset before you can begin using them.