Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Are your user accounts synced with AD to O365 (DirSync / FIM), or are the user accounts hosted on O365 itself?
If the user accounts are hosted in an internal AD and synced, then any of the methods for allowing users to update their own internal info are still applicable. The changes will just sync during the regular DirSync / FIM update. The way Snowknight26 posted should work (it used to, bur I haven't done it since XP).....But there are free Web based utilities that provide nice interfaces too (run on a local IIS server)....