Once an Instance is selected from the Instances tab, it can be executed using the Execute button.
Once an Instance has started to execute, execution view of the instance can be viewed by selecting "Render Instance". The following graphic shows the execution in relation to how the the workflow was defined.
If steps within an instance executes multiple iterations, using the render instance it is very difficult to view the execution of that instance. The following graphic shows a serial execution view of the instance.