can't edit cfg files to add textures

I've installed the cfg editor but it never loads up the files. I can copy off the cfg to word but can not paste anything into the cfg file... I had no problem modifying fx9. I added scenery files, manipulated ai traffic to real world and added new aircraft and textures to existing. I must not have the right tools to modify FSX... Link please???Advice???
Thanks

Have you ever tried editing the cfg files in notepad.
Try this link for installing addon textures. http://fstipsandaddons.com/tutorials/installing_repaints.html