An Automation Host is your local machine where your automation scripts are deployed and running. qTest Automation Agent Tool is also running on this machine so that it is registered in qTest.
Java 7 or 8 need to be installed in your Automation Host so our qTest Automation Agent can work properly.
You can download qTest Automation Agent Tool from qTest's Resources page.
Click on your account's displayed name and then on the pop-up windows that appears, you can either change qTest URL or qTest credentials for the host to connect to your qTest application.
Click on Save button. If the host can connect to your qTest with the input information, the settings are saved.