Two great tutorials from ExactTrades with information on how to use the Think or Swim Platform by TD Ameritrade. Below their two-part tutorial about Think or Swim are more videos on how to setup your account and make it a little easier to navigate if you’re new to the platform.
ThinkorSwim platform from TD Ameritrade part 1
ThinkorSwim platform from TD Ameritrade part 2
How to Setup Fibonacci Retracements in Thinkorswim
Thinkorswim Platform Enhancements