minehut has no support for mods and never will in the future you can add plugins instead here is tutorial by minehut https://www.youtube.com/watch?v=HUxXi5iSi7g&ab_channel=Minehut minehut:provied plugins
https://www.youtube.com/watch?v=Fzy_MgBeHFQ&ab_channel=Minehut:custom plugins