Need help with CoD Radiant please help.

[T1GER404]

Hi there. Just started to do some mapping today allthough I have no idea what to do yet but I can see mapping does take time and so on. But I downloaded CoD Radant today and this error appear's please help
[Could not locate a valid installation of call of duty] I mean I have Call of Duty Waw installed. Whats wrong please help

If anyone could help resolve the problem I will highley be thankfull

[B4.]

in compile Tools, click the Preferences tab and browse for your game folder "Call of Duty 4 - Modern Warfare"