When you are ready to run the GameDay, click the GameDays icon on the left navigation and then click the GameDay that you want to run.
On the GameDay Details page, you will see the configuration and scenarios. Click Run Scenario next to the scenario you want to run first.
Gremlin will open the Scenario Runs tab where you can observe the live view of the scenario as it runs.
If you need to run additional scenarios, click the Configuration tab and select the next scenario you want to run. You can add results to every run and mark it as Passed or Failed once it has finished.