When i went to universal studio through city walk i could not find the way to island of adventure can somebody help me how to get there?

It's to the left of the Hard Rock Café (when facing it from CityWalk). Look for the tall stone tower with the light beacon on top. Also if you happen to be inside Universal, you can get to IoA via the Hogwarts Express located inside Kings Cross Station.

While in city walk go left after pass big screen to Islands right is to Universal side.

Left to islands of adventure right to Universal studios

Left side when you are facing the city.