You can manage KeyStores group by clicking on Manage KeyStores Group button
(Screen: KeyStores_Manage KeyStores Group)
You can create KeyStores Group from this segment. Although, this is not a mandatory step to follow.
(Screen: KeyStores_ Manage KeyStores Group_Create KeyStores Group Details)
You can manage your KeyStores with the action buttons.
(Screen: KeyStores_Action Buttons)
Click on Assign KeyStores button in the center to assign or unassign certificates.
(Screen: KeyStores_Assign KeyStores)
You can unassign the devices by deselecting the checkboxes.