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You must choose the "Manage Routers" option 
If you click on this option, the Manage Routers wizard will appear.
Using the add and remove buttons you can assign and unassign routers in the IP network. To apply the changes it is necessary to click on the Finish button.
You always can remove directly a router from an IP network using the "Remove Router" option. This option is located in both IPNetwork View and IPNetwork Editor, but it is only available when the user right clicking on a router element. 
Action Queue
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Actions are put in the queue in order of entrance. But users can change this order using the blue arrows buttons at the left of the ActionQueue View, and save the changes using the Save button. The order is important because the first action in the queue is the first action in being executed on the router.
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Execute: To execute the whole queue you need clicking on the Execute button, the first one in the upper menu of the ActionQueue View -
Delete: Deletes the whole Action Queue from the server. -
Refresh: Gets the current Action Queue from the server.
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The configure interface wizard allows to configure the IP parameters like IP address and mask for IPv4, and IP address and prefix for IPv6.
Change the state of physical interfaces
There are two options in the IPNetwork View menu to turn up and down the physical interface: 
When an interface is down is displayed together a little red cross. 