Task Amazon EC2 - Reboot Instance
The Amazon EC2 - Reboot instance requests a reboot of one or more instances. This operation is asynchronous; it only queues a request to reboot the specified instances. The operation succeeds if the instances are valid and belong to you. Requests to reboot terminated instances are ignored.

Connection
To use Amazon EC2 Tasks you need to create an Amazon Connection first. Click the Settings icon to open the Manage Connections dialog.
Instance
The instance ID to reboot. Click the Refresh icon to populate the drop-down instance ID list.