Install SpongeForge

SpongeForge is a way to install Bukkit plugins onto a Minecraft Forge server and Forge modpacks. This guide assumes that you have already created a server in Command Center and installed a Forge server.

Login to your Minecraft server SFTP and open the game folder (such as forge-minecraft).
Download SpongeForge.
Upload the .jar you downloaded to the mods folder on your server.
You should be good to go!

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Any plugins you download for SpongeForge should also be uploaded to the mods folder on your server.