We will be able to become registered users of Pottermore later, so we will need usernames and passwords because it wouldn't work any other way. atau did I get your soalan wrong?
Yes. anda dont choose them though, there are a senarai of I think 4 (lol I don't even remember for all I know it was 2) usernames selected at Rawak in which anda can choose from. Most of them sound really cool so don't worry you'll probably like it atau grow to like it as anda go along. I go sejak the name MidnightElm, trust me you'll like the names I had trouble deciding which one I liked lebih lol. :)