Setup - Glazelf/DiscordRPC GitHub Wiki

Achitecture

Download the correct build for your architecture. The only difference is the discord_game_sdk.dll file.
If you're using the wrong one you should get an error similar to "An attempt was made to load a program with an incorrect format" when trying to click Connect. Just try the other one.
Architecture downloads from the releases page:

Application

You will need to create your own application, to so go to the Discord Developer Portal. There you can change various settings and upload assets for you to use in your rich presence.
Copy the ClientID/ApplicationID from the Portal and paste it in the Client ID field in the app.

Images

Images need to be uploaded from within the Discord Developer Portal.