You cannot add Mods to the server as of right now, but you can add plugins by:
Installing Plugins
1. Find the “Plugins" section in the panel and find the plugins you'd like to install
2. Click on the plugin then click the "Install" button
3. Find the "World Settings" tab on the left and click the "Save World" button
4. Go to the “Home" tab and stop your server (wait till the status says "offline")
5. Lastly, once your server is offline, start it back up again. Once you join it your plugins should be installed
Alternatively, you can view this video: https://www.youtube.com/watch?v=HUxXi5iSi7g
You can also buy more ram using credits.
Buy them at https://minehut.com/panel/minecraft/properties and click ‘Max Players’ then use the reference image below for more information:
https://gyazo.com/ac9411c0648f93bd5df9c543d5673d2f
Moved to Community Support