Editing a user's first and last name

[RiverMonster]

How do you edit the first/last name of a user who is an SME or viewer? I thought it would be the same as editing a team name but it seems it is only possible for an author to edit his/her own name, but not anybody else's.

I tried deleting and recreating the user but this does not work if the email address is the same - it seems to store the original names somewhere and adds them back.

Am I missing something?

Thanks

Adrian