dont worry - like the others said, if you left feedback, or someone else has recently left feedback for you, then it will show up as soon as it has been approved
This may take a couple of weeks depending on how busy things are for admin .
Also if you want to look at feedback that other people have left for you previously, then click on the numbers next to your name and it will take you to the page where you can view the feedback. It will automatically show the shorter feedback comments, and at the side of those comments you will see "View detail" - this is where you can click to see the long/full comment