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By "rotate" they mean tilt... You tilt the upper case (which contains the keyboard" up so that it rests against the screen. If you happen to have a helper nearby, get them to gently hold the upper case, when it's tilted up, in place so that you can do step 10.
I recommend that you have several (ie 10-12) little cups nearby with a pen and some small scraps of paper to write on. As you remove screws, step by step, place that step's screws into one cup and label it "Step #X". That way, when you're putting everything back together, you won't have to guess as to which screws were for which step. I did this, on a recommendation of a friend who did this very same repair, and it made the reassembly even easier.