Go to Tools - Choose spelling and grammar. Click the Dictionaries button and click edit. Edit the list of words, deleting the incorrectly spelled words and then close the file. Then select options from the tools, click the spelling and grammar tab and then put a check next to check spelling automatically. Otherwise, you will have turned off the automatic spell check as you type. If you want it turned off, this is where you would turn it off.
Trust me, this is something you could do almost anytime in our computer lab as I have people who love to click before reading!