Railworks America

Good evening,
I have a question in building a standard scenario.
How do I install or place a scenario marker?
I want to go from point "a" to point "b" as a learning task for standard scenario pulling a consist to a destination for drop off.

Thanks,
Glenn

This helped me alot : http://www.youtube.com/watch?v=zbArFwYTc1k&feature=mfu_in_order&list=UL