Log on to your Tosca Sever and from the Landing Page, click on Test Data Management.
In the address bar of the browser, your URL will look something like this:
Simply remove the section "/TestDataManagement/Management" and hit enter.
This gives you a page that says:
TestDataService is running on /TestDataService
TestDataManagement is running on /TestDataManagement
If you click on the /TestDataService link, you'll get the URL for the TestDataEndpoint, which should be similar to:
The TestDataRepository is the name of the repository that was created in the Test Data Management screen. In my case, it is TDSWorkshop.
After entering these values, my test configuration looks like this: