Problems when trying to attach a new PC

Hey,

Joined the Business version of TeamViewer today and I'm trying to attach computers to my account. Whenever I go to "Extras -> Options -> Account Assignment" and enter My Email and PW - a message pops up, telling me that "for security reason they want to know that this PC is reliable", but I DONT  want to add a computer I can Connect from (Im allowed to 3 devices as a business costumer) , I want to attach a computer to my account so that I'll be able to Remote Control it.

How do I do that?! 
Thanks in Advance.