Download the resources you need from the Resources folder. Upload your recording by selecting the "Recordings go in this folder" folder and click the "+ File" button to select and upload your recording. You can rename or delete your recording using the options that pop up when you click the little column of dots on the right hand side. But please don't delete anybody else's file!!
To move back up in the folder system, click on the "breadcrumb trail" at top left, (e.g. Files > Resources > Backing Tracks...)