In Minecraft when I click Multiplayer it just loads and finds nothing.I wanna see other people's servers. How?

You have to find the server IP and add it to your server list. Or if you are looking for a LAN server, if they are on the same network as you they should come up automatically.

In the Java Edition of Minecraft, multiplayer list is a DIY deal… While it'll search for any servers on your Network (aka LAN), you have to MANUALLY ADD online servers to show them on the list.

There's NO centralized server list, so you have to search online for public servers or know somebody with a private server.