Please i want to know how can i reset the Arduino, it has a program and i can't out another it's anyway to reset ?
Push the reset button :P. Your question is not very clear.
You just upload a new sketch. Microprocessors are always doing something. It isn't like a PC where you start/run different programs.
Sometimes it is necessary to press and hold the reset button until just before the IDE starts its upload.
If you're using Linux there's a bug somewhere which causes the IDE to fail to talk to the Uno if the existing sketch is sending Serial data out heavily.
To "reset" the Uno power it down, hold down the reset button, and, while still holding the reset button down, power it up again. This will prevent the existing sketch from running. You can then upload a new sketch.
To cure the bug which causes this problem, see /cgi-bin/yabb2/YaBB.pl?num=1286088093/30#34
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