Steps to reproduce:
Please contact Support to make these changes on your behalf. To update (or create) a pre-processed segment, a user must have admin access or super user access.
In addition, while being logged in as a normal user, I don't see segment configuration fields (apply to all websites, choose realtime or pre-processed). Not sure if that is a bug. I was also not able to enter user settings using latest master (699f9cd8bd84ee53c8b4e65e948052dbd8858d10).