Simply go to https://www.mcjukebox.net/admin, sign up for an account, set up a server, and then copy the API key from the page that allows you to control the server. After you have finished installing MCJukebox, you should restart or reload your server. Then you will need to do /jukebox setkey APIKey>. Remember to use the key that you copied from the panel for this step. Then, while you are in the game, enter /jukebox to access our web client.