I cleaned my frigidaire oven and now it won't heat.stove top is fine and control buttons... when I lift the bottom heating element it start to heat.I wonder if I moved the heat element out of place.

It sounds like you pulled something loose. Here is a manual: https://dl.dropbox.com/u/8010163/Frigidaire%20Stoves.zip
And, you need a meter to test the connections. Here is an instruction manual: https://dl.dropbox.com/u/8010163/Whirlpool%204322537A%20How%20to%20use%20Test%20Equ ipment%20Service%20Manual.pdf
Make sure to unplug stove before testing for continuity (Ohms).