Click on the file you want to transfer to highlight it, then click on the arrow that points to right to start the transfer. If you are unable to save the file on your hard drive with this exact name, simply upload it and once it is there you may rename it. Please remember that letter case is critical to uploading your data correctly. Another common mistake is not having the case in the HTML code match the files that you have uploaded. Please note that HTML is case sensitive.
Many people store all of their files in lower case letters to make things easier to remember.