HELP ME?

Hello blippers...I have been staring at photoshop 7.0 for ages trying to find the tool that allows you to play with the distorted angles you get with a wide angle looking up a building.

I can't find it and like most blokes don't like to read the manual, so thought that one of you kind folks might point me in the right direction so that I can correct these in future.

Thanks in anticipation.

K