If you are looking to play the missions that have been created by other players, then it is a simple process. All of these missions will be saved in the “workshop” folder on your computer.
This article will outline how to find this folder and what steps you should take after locating it.
Open up the “My Documents” folder on your computer. This is where all of your personal files will be stored.
Find a subfolder called “Arma”. If you can’t find this, then it might not have been installed properly and you should re-install Arma with the correct installation options that are outlined in their FAQs page for downloading new players (on Steam).
Click into the newly found folder and open up another folder titled “Missions.”
There should already be two default missions saved here; one from Bohemia Interactive Studios, and one made by yourself if you ever created any scenarios before.
You’ll need to make sure there’s enough space available to store more content though.