How do I make ImageMagick work with Mediawiki

[battlevi]

Hello all,

I havent been able to configure imagemagick with Mediawiki. The usual process requires knowing the root directory of ImageMagick which I cant find.
www.mediawiki.org/wiki/Manual:Image_administration#Image_thumbnailing

I have ticked the ImageMagick option in the database options thing so that isnt it.

Any help is appreciated a lot