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When the student selects to start the test, their browser will provide the option to launch the Lockdown Browser (shown below in Chrome). Approve the launch, and the test will open in the Lockdown Browser for the student to take. The student will then complete the test in the Lockdown Browser.
Reviewing Proctored Exams
When you return to the Respondus Dashboard, new options will be available for any test that has recordings from student attempts-- Class Results, and Exam Stats.
Selecting Class Results will provide a list of the student attempts that have been made. You can then navigate through each attempt similarly to any test made within an Original course. Exam Stats will provide aggregate results for the test based on all student results.