Can't Mount Zorin OS

it says i cant mount zorin because there is no mountable file systems. and i am using a macos big sur 11.2.3

Does this help?

I have similar issues with external USB Flash drives on Big Sur 11.0.1 (MacBook Pro (Retina, 15-inch, Mid 2015)). After plugging in USB drive I can't find it in Finder but it still can be founded under /Volumes folder. Open Finder -> Go -> Go to folder /Volumes (shortcut SHIFT + CMD + G).

thank you, but it dosent help. i cant find it in the volumes folder

I am not sure about Mac computers as I have not used one in a very long time. Like Windows, Mac is known for locking things down.
Windows added "Secure Boot" which inhibits, interferes or even prevents Linux code- Mac added something similar. This must be disabled on newer Macs.

You will need to scroll to the relevant portions, as I have no reason to think you are installing on a second drive- but if you are installing on a second drive, this guide may be helpful in several ways.