Tasker Turn Off PC

Please help me fix my problem. I need to turn off my computer using Tasker. I use a program on my computer called Airytec Switch Off. I can't pass login and password authorization on Tasker to perform the task of shutting down the computer via HTTP
http://www.airytec.com/en/switch-of...motely-from-any-computer-or-mobile-phone.aspx