"Edit" sounds reasonably technical, but step back from computers and remember people that revise, update and correct documents are called editors. It's not a CS exclusive term.
Wikipedia defines edit as
the process of selecting and preparing written, visual, audible, and film media used to convey information through the processes of correction, condensation, organization, and other modifications in various media, performed with an intention of producing a correct, consistent, accurate, and complete output.
Change implies to me that I have one thing and I'm going to swap it out for another; for instance if I was asked to change my desktop wallpaper I would replace it with an entirely different image file.
Edit strikes to the heart of what you're usually doing when you click an "edit" button; you're using the same object or file, but you are tweaking, updating, correcting or adding to the content; this is different than changing my task list into something completely different. To extend the above example, if you asked me to edit my wallpaper I would probably open up an image editor and tweak the current desktop image.
Editing is something an editor does, and it's something everyone is familiar with. Perhaps more importantly most applications use the term edit in this manner, and breaching the norm will likely cause a lot more confusion despite the attempt at "natural" language.