How To Install Arclight
To get plugins to work on 1.14+ Forge we'll need to use something called Arclight
You can download this via our version installer, just select Arclight from the drop-down.
Head to this link: https://github.com/IzzelAliz/Arclight (opens in a new tab)
Download the version you need. Some might be hidden under legacy, or on the release page on the right. Upload it to your server via the file manager
Set the Arclight jar on the overview page, and you're all set.
You can now add plugins to the plugins folder in the file manager.