Hi Van,
This is not an admin setting. Nice suggestion.
You could disable access to the UserCP using a permission set but that would disable access to all area. The easiest way would be to edit \Skins\[SKINNAME]\EditRegistrationDetails.ascx and add a visible="False" tag to the table row containing the username textbox, this will then ensure they cannot update this within the User control panel. This is shown below...
Remember to make a note of this change if you would like to reapply after any updates. Does this help? Kindest Regards,Ryan HealeyDirector / Developer
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