You can access the library of your profile by clicking on your avatar. You can find your avatar at the top right of the website. Click on it and the following dropdown menu will appear.
Click on My Library and a new window will open.
From then on you can use the tutorials on How to Upload Files and Create a Playlist at the Radio Station's Media Library.
You will be able to use files from this library during your live show at the Virtual Studio or to load the files/playlist to an upcoming episode of your show.