In the Details area for the object, click the External Links tab.
The External Links table, which can be empty, appears.
A Details Panel window opens.
Type a name for the external link.
Type the URL for the external link in the External URI field.
(Optional) Click the Select Concept for Object Type button if you want to specify the type of content to which the URL points.
Expand the ClassificationSchemes node. Locate the content type by expanding the ObjectType, RegistryObject, and ExtrinsicObject nodes. Select the concept, then click OK. If you do not find a suitable type, click Cancel. You can create a new concept for ExtrinsicObjects if you want.
Click Add to save the new object and close the Details Panel window.
Click Apply in the Details area for the object.