The TestResults.io Designer will establish the connection to the TestResults.io portal. This will allow you to download the test cases and test models you need to automate. The target server and project is automatically associated with your project upon creating the TestResults.io solution.
An overview of the configured TestResults.io servers can be found in the options screen:
Go to Tools --> Options --> TestResults.io --> Servers
You will see the following overview of the servers: