All ban appeals are processed on the forums section of the website, which can be found here.
Here are the steps on creating a ban appeal:
Determine what your token is - Your token is a unique eight digit string of characters used to prove ownership of your forums account.
In your ban message upon joining into the server, your token is a field named token in the message.
Register for a forums account - You will need to register for a forums account in order to create the actual ban appeal.
Review the ban appeal rules and process - You can find this information here.
Create the ban appeal - You can do this by creating a new thread in the ban appeals category.