Rename user in org plan

Hello.

We upgraded to org.pla. some time ago and transferred users. Some of them have nicks/names that needs to be updated to clarify who they are, like adding last names. For org.plan this cant be done by the user and I (org admin) can not find an option to set usernames for members.

How do we update user names for organization members?

Update for those curious:
Have the user logg in using SSO (if configured) and their name will be provisioned from your Active Records.