You can use the Edit Key Pair dialog to edit the description of a Key Pair 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 Key Pairs tab, then click Edit (or double-click the key pair) to open the Edit Key Pair dialog.
Modify the Description for the Key Pair resource.
Click Save to update the Key Pair resource.
Click Close to exit the dialog.