To install mods on your Minecraft server, open the More menu in your server panel and go to the Mods page. From there, you can browse available mods, choose the ones you want, and install them directly from the panel.
This system handles the installation process automatically, so you usually do not need to manually download mod files or upload them to your server.
After installing your mods, restart the server to make sure they are loaded properly.
If you need help with this, please submit a ticket.