In order to install CurseForge mods you must first be running a Minecraft Forge jar.
1. Search for and install a Forge modpack via the "Minecraft Modpacks" tab in the control panel. this will install the core forge server files. Version 1.17 is not currently compatible so you will need to use 1.16 or before.
*Note: You will also need to install the Forge client on your own computer and any mods you wish to use.
2. Install mods on the server via the "Curse Mods" tab.
