You can download and install the tool from here. Once the installation has completed, you will have to invoke the tool by clicking the desktop shortcut. You will have to click settings tab and add your domain credentials, to fetch the list of managed computers. While adding the domain, ensure that you specify a valid domain net bios name or a fully qualified domain name, provide admin username and password of the selected domain. Similarly while specifying the user name you need not include the domain alias name. Refer the below screenshot for adding the domain.

You should now choose the comptuers which needs to be managed. Click Managed Computers tab and choose "Add", to add the computers. You are now ready to perform the any of the below listed operations.