On the Home page, click Identity Servers > IDP Global Settings > Virtual Attributes > Attribute Source.
Click the attribute source you want to modify.
On the Edit Attribute Source page, modify the details as required.
For more information about the fields on this page, see Creating an Attribute Source.
Click Save. Update Identity Server.
IMPORTANT:If the attribute source is being used by a virtual attribute, you need to update Identity Server every time you edit the properties of an attribute source.