Step 1:
On the front page pick a platform eg, Microsoft or Nintendo.
Step 2:
Pick a console and click on one of the links (Make Sure it's ISO or Decrypted.)
Step 3:
download a game.
Step 4:
Go back to Sandler Site and click on the emulators drop down menu beside the playback window (the speaker and volume control)
Step 5:
Pick an emulator for whatever game you want to play.
Retro Arch has most emulators the other ones are for good measure.