I found a ipod and kept it for 2 days..i thought want to use it but it stated there as device is disabled..how may i use it?

Turn the iPod into the nearest police station, it does not belong to you.

If the iPod is disabled, it means the owner has activated iCloud lock.

There is NO WAY to bypass iCloud lock.

There would be NO point to having iCloud lock if it could be bypassed.

iCloud lock is a anti-theft measure.

You are not going to be able to use the device. The lock you have encountered is designed to prevent exactly what you are trying to do - appropriate a device which is not your property. There is no way round the lock at all; and as said above you have no right to keep the device and should turn it in to the police.