Hello,
In the race viewer, you can access the tutorial by pressing the
settings button in the top right, and then the
help button.
This tutorial will explain the ways that you can manage your cars within races and guide you on how to be successful.
Additionally, pinned to the help and support subforum are multiple guides which provide additional guidance for the race viewer. I'll link a few of them below.
2022 Complete Guide (written by Rhys James)
2017 Beginner's guide (written by Joey McLane)