I found many bugs in zorin because I'm a SQA Engineer I need zorin official email where I can Report Bugs.
If you have pro you can reply to the email that contained your product key. Please include the key when replying.
If it is core/lite, you can visit the official zorin page and utilize the contact us section on the page.
On the forum you can directly message AZorin and zorink with any concerns.
They may take a little while to respond in any case, but they will respond.