If you've been finding it hard to follow,AND NOW DAY 1 HAS CLOSED, never fret! there are six more days to follow the insider (click on the title of the article to be brought straight there) and find the question. Tomorrow it will be on Chamber of Secrets so keep it handy! you will be asked to multiply it by a number again i'd say...this finishes your url http://quill.pottermore.com/ ... today it ended with 245 and up until recently the MAGICAL QUILL was available for selection and registration. I just got in thank God, though i reckon i'll have to go again for an email!
GOOD LUCK ALL!
update: apparantly all registered today gets in!!! And you can use your email for 48 hours!! yay!