Due to an influx of spam, we have had to temporarily disable account registrations. Please write an email to accountsupport@archlinux.org, with your desired username, if you want to get access. Sorry for the inconvenience.
Announcement in -staff ML:
https://lists.archlinux.org/archives/list/staff@lists.archlinux.org/message/EFXA72JZ32OFYJ2LSHPOXB2CKHTCHGXQ/