If you can see the "slots" underneath the screen, click the lower one, then click "Mount Folder", then select the "MySprites" folder this came with. I'm sorry for the inconvenience.
what do I do after mounting folder MySprites? the screen remains a blank command prompt.
Either hit ctrl+c, type "run", then hit enter; or just restart.
You mounted the "MySprites" folder to slot 1. It needs to be mounted to slot 2. The file "user.minidisk" needs to stay mounted to slot 1.