You must know your account credentials on the remote computer in order to get access to it. The username and password is obligatory.
Did you follow the steps in the Getting Started Guide on our website?
https://www.nomachine.com/getting-started-with-nomachine
I thought I was supposed to create an account on the website before installing the software?
Creating an account on our website is not available as a service, this will be possible when we release NoMachine Network in the near future. The username and password is of the remote computer (in your appartment) that you want to connect to.
You can find more info about what you need here:
What do I need in order to use NoMachine?
https://www.nomachine.com/AR10K00723