Put the miz file inside:
C:\Users\[YourName]\Saved Games\DCS\Missions
OR some other place where you have your missions.

Put the folder "iqaf215" inside
..DCS World\Bazar\Liveries\uh-1h

NOTE: The skin "iqaf215" is NOT my work, it's made by a REAL artist.
Thanks TIMKA for doing such great skins!