Just remember these MS-DOS commands:
"X:" is to change the driveletter, where X is the letter (ie: "C" is your primary harddrive, "A" is your diskdrive, "D" is usually the secondary harddrive, etc...)
"cd FOLDER" cd is used for entering folders, where FOLDER is the foldername. You have ton enter in a folder in order to run its files. to return to a previous folder, you have to type "cd.."
"dir" this will show you the contents of the folder where you are.