Editing difficulty settings on your Arma 3 server is easy, but the process can be a bit daunting at first. First, please review the official wiki page for this feature.
How to access the Arma3Profile file:
Step 1: Log into your game control panel.
Step 2: Click on 'Game Servers' on the left to open up your Arma 3 server's main control page.
Step 3: Click on 'Configuration Files' and open the file labeled: \A3DS\Users\TCAGame\TCAGame.Arma3Profile
Step 4: Modify the file according to your desired settings using the wiki as a primary source of reference.
