You can manage your Authorizations or reset your License Key(s) usage through your Audiomodern account dashboard -> "My License Keys" tab. There you will find a 'reset' button which will reset each License Key that is available on your account.
If you did not purchase your license key from the Audiomodern web store, you can register the software to us first, here is how: https://audiomodern.com/buying-from-third-party-resellers/