Hmm.. you should take off the solved since this is not solved.
If you want you can get code hints you can construct with:
sf::Sprite bluePaddleSprite = new sf::Sprite();
Err.. I see a new... that means heap memory and such, which I am kind of shaky with. But just so I understand, would that create a pointer to bluePaddleSprite called Sprite and then through that let me use code hints.. or am I way off?
Also, and I know the questions are probably becoming annoying but:
I got the formula to work with the paddle for when it goes "down", but when I tried making a version for up, it does not work.
I though simply taking the same one as before and changing the > to a < would work but when I do it goes back the problem of not letting me move at all...
Edit: That change to bluePaddle.LoadFromFile("bluePaddle.png"); did not fix the problem sadly.. I don't know whats going on..