If you have never started your server before, you will first need to start it for the necessary file to generate.

Stop your server

Delete the existing world folder using an FTP program such as FileZilla
Getting started with FileZilla
To delete the folder, you can right click it and click Delete.
The world folder will be the same name as your world. You can find the name of your world in the World box on the main page of the panel.

Navigate to the Files>Config Files tab of the panel

Open the first file called Server Settings

Locate the Level Seed field and enter your desired seed

Save your changes

Start your server

A new world will generate with the desired seed.
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