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I want to connect an I2C sensor to arduino robot , I can't figure out which pin is SDA , SCL, GND and 3.3 v .
can any body help
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There's 3 rows of pins to the top left of the display, if the keypad is at the bottom right.

You can find an indication of that location here (scroll down about 20 % from the top of that page), you'll find a picture.
You can also find the schematics for this robot.
You need the program "eagle" to open this, open the "control board" file.
To the right you will find that these 3 connectors are in parallel, meaning they all are connected to the same signals.
It goes like this:
Pin 1 = GND
Pin 2 = 5 Volt.
Pin 3 = SDA
Pin 4 = SCL

From the pictures i could find, there's no telling which pad is 1, those pics are too small or out of focus to see.
If you have one square pad and three round ones, the square one is pad 1.
Or any other mark, marks 1.

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Have a look at "blink without delay".
Did you connect the grounds ?
Je kunt hier ook in het Nederlands terecht: http://arduino.cc/forum/index.php/board,77.0.html

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Thank you very much
I'll try it
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