You have the denominator in your formula as $E2, which doesn't quite do what you want. That $ holds the column indicator, E, fixed, so that it would not be automatically changed to another column (F2, G2, ...) if you filled or copied the formula to other *columns*. What you need here is just to keep the row indicator, 2, fixed, so you need E$2 instead. (If you needed to keep both fixed, you would need $E$2.) Use =E3/E$2. I'm assuming that you know how to fill this down the column.
Incidentally, I don't want to be dismissive, but you cannot really expect to learn the basics of spreadsheets by asking questions of hundreds, perhaps a thousand or two, of fellow user around the world. You may want to find a book, get advice from a friend, take a course (at school/college? at work? in a library? or elsewhere?), search the web, or perhaps join a club. But don't let me put you off asking.
I trust this helps.
Brian Barker