Press the MENU Button
Go To Setup Menu (Wrench)
Make sure you are viewing the full menu
Click down to Image Comment
Press the right arrow
Click on Input comment
Press the right arrow to get to the input screen
Input your comment by moving the thumbwheel to the character you want to input and pressing OK - to delete a character, press the trash can.
When your comment is as you want it, press the + key on the lower left (SET)
Then click on Attach Comment to place it into the EXIF data
Hopefully, my instructions are understandable. It worked for me.