Tonto

I have downloaded Mechjeb and am able to attach it to a spaceship, but when I get to the launch or when flying, even though I can see the Mechjeb device on the spaceship, there is no MJ icon on the screen, meaning I cannot use Mechjeb. Hopefully someone can tell me what I might be doing wrong, or suggest other fixes.

Thank you steve_v. I found my KSP/GameData folder as a subfolder under my Adobe Lightroom folder which I find quite curious. Nevertheless, it works. Tonto

I have been trying to install Mechjeb. Online reference says to download Mechjeb, unzip it, then move it to Game folder. Does that mean to move it to Squad, or to Kerbal Space Program which is within Squad? Or, is this not correct and if so, what do I do?