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.
The notification volume setting is missing
Over the years that I have been using Linux, updates have been coming periodically, as a result of which the notification volume setting disappears.
This setting should be where it is marked in the screenshot.
There is no such error in another distribution. I guess this is a packaging problem.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information