How do I know what I have created so far and make changes?

The blue box marked ‘My discs / downloads’ will always be on the left side of the screen, this is your custom disc / download summary. This displays the type of disc or download, how many total minutes your selection of tracks currently adds up to and how much your disc is going to cost.
For full details click ‘View my play list’.
You can also alter the order in which the tracks appear.