How do you download pictures from computer to memory stick?

By "memory stick", I assume you mean flashdrive. If you want to transport pictures from your computer to your flashdrive, stick your flashdrive into the computer, and open up your pictures. When your flashdrive is in place, another small window should open up with a list of options for you. Among these options should be "open files" or something like that. Click on it, and it will open up any files on the flashdrive (If there is nothing on the flashdrive, there will be Words at the top, saying "no files on flashdrive" or "flashdrive is empty" or something like that). Go to your pictures file, and drag any pictures you want from the file to the flashdrive. The End.