From this detailed guide, you can learn how to install Forge Addon On Your Kodi.
‘Forge’ is a new, premium Kodi add-on that can be installed from the Forge Repository. This is a fork of FEN Lite AM that provides movies, TV series, anime, and other on-demand content.
This is a ‘debrid only’ add-on meaning a premium debrid service like TorBox, Real-Debrid, or Premiumize is required to stream content.
Important Note: After testing we discovered that you also need to install an external scraper like ‘CoCoScrapers’ for this to work properly. This setup is a little more advanced and similar to Umbrella Addon for those familiar.
this installation guide applies to all compatible devices including Amazon Firestick, Fire TV, Android & iOS, Mac, Windows, Android TV, Android Boxes, etc
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How To Install Forge Kodi Addon
- Open Kodi
- Be sure to have the Unknown Source box checked as Kodi requires this before installing 3rd party add-ons.
- HOME Screen > Add-ons > Settings button 
> Add-ons > Enable Unknown Sources.
- From your Home Click Settings (cog icon top left)
- Click File Manager
- Click None
-Type in the following EXACTLY
https://silencebob2.github.io/forge-releases
or
https://tinyurl.com/forgerepo
- Click OK
- Click back on your remote/keyboard
- Click Add-ons
- Click Install from Zip File
- Click forge-releases
- Click repository.forge.x.x.zip.
- Wait for Add-On Enabled Notification
- Click Install from Repository
- Click Forge Repository
- Click Video Add-Ons
- Click Forge
- Click Install
- Wait till you can see the message Add-on installed pops up. That's it! You can now find you addon from main menu > Add-ons, enjoy.