You can edit any line by holding down the key and rolling the thumb wheel to wherever you want. Or to select the text you want to overwrite, just hold down the key and roll the thumb wheel, then just start typing to overwrite.
Okay Im really confused on how to get this to work. I used my LAPTOP to download the ring tones, is there a way to transfer them from the Laptop to the BlackBerry? Or do I need to use the browser on the BlackBerry to download the ring tones?