Select Diskimage option & browse Zorin OS/Linux ISO file
Select hard disk in type & select drive
Click OK, so simple :)
It may take some time to finish & give you restart option. After restarting computer, it will give you option to select windows OR Zorin OS/Linux.
For removing Zorin OS entry, just run again UNetbootin in Windows, so simple :)
Later on when you are satisfied with Zorin OS & want to install properly on your system
Be careful, this a is bit advance option to do. Make a free space/Linux partition from Windows OR read 'Repartitioning using Parted Magic' section. Run Linux using the above method & start installation. When if it issue an error 'Failed to unmount partitions' then do this command in terminal 'sudo umount -l -r -f /cdrom' & then click Continue, source. Remaining steps are as usual. Installation tested successfully with Zorin OS 2 Live 32 Bit, etc.
OR you can make a Zorin OS USB with UNetbootin & install from USB