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    Guys if i increase resistance does Power increase since
    P= I^2 R

    or does it decrease since  P= \frac{V^2}{R}
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    The first equation tells you that power would increase asuming the current in the resistor is constant.

    The second equation tells you that the power would decrease assuming the potential difference across the resistor is constant.

    You haven't described the circuit you are considering, so there is not easy answer to which of these situations - or some variation of them - will happen in your case. But you should be able to look at your circuit and work it out from here.
 
 
 
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