Change Post Process on Camera

Currently trying to change the Post Process Settings on my Players Camera and am not having any luck. Was wondering if anyone knew how, what I have so far is listed below.

FollowCamera->PostProcessSettings.bOverride_SceneColorTint = true;
FollowCamera->PostProcessSettings.SceneColorTint.R = 200;
FollowCamera->PostProcessSettings.SceneColorTint.G = 100;
FollowCamera->PostProcessSettings.SceneColorTint.B = 100;

How did you solve it? I also met the same problem.