You can use the Edit Region dialog to edit the description of a Region resource for the target AWS platform.
In the Web Interface toolbar, select the Platforms tab.
Select the platform, then click Edit.
Under Associations, select the Regions tab, then click Edit (or double-click the region) to open the Edit Region dialog.
Modify the Description for the Region resource.
Click Save to update the Region resource.
Click Close to exit the dialog.