If you're playing Minecraft: Java Edition, downloading and installing an FNAF map is a little more complex than it would be for Bedrock.

You can set up a server on Aternos, a hosting platform that provides free servers. Here's a small guide to creating a free server on Aternos: Step 1: Open the official Aternos webpage.

"Minecraft" maps can be downloaded for free from community sites like Minecraft Maps or CurseForge, and then played on and edited.