I created my username as: nicolas.plourde. Then, I went to modify the settings of my site's settings. Everything went fine but when saved I got error saying that the Content Database can only contains alphanumerics characters. Because my database name is the same as my username. So, I can't save and I don't see how I can change my database name. The only solution I see is to recreate my whole account.
I hope it can help you.