Back button..

[krs-world]

I would suggest we keep an explicit 'Back' button to go back to the previous page in each screen (I think we have it in some of the pages, but its hard to locate -- is it at the top left, with the arrow symbol?)

Hitting the browser's back button takes you back to 'select materials page', which is a bit annoying as you lose context -- I am guessing this is unavoidable?