JamesAirsofterAgent

You did what with the what now? There are a billion guides on this already - I'd suggest a bit of Googling, but basically you extract the mod folder (should start with an @) to the root of your ArmA 3 install, the use ArmA3Sync to detect those mod folders, adjust the command line accordingly and launch them with ArmA. 7Zip and Winrar are only there to uncompress the files - nothing more.

It says please set arma3 executable location, where would that be? The arma 3 folder?

Yes, prof ink has posted a couple above the location of your root folder