Members can update their Heylo profile anytime through account settings from the top right of Heylo.
To edit private info or group-specific icebreakers, tap your name at the top of the members screen. Alternatively, members can access group-specific private info from the group tab as well.
Admins cannot edit a member's profile for them. Member information, from name to photo and personal details, are only editable by the member themselves.