What should I do before I start trading through Pepperstone on TradingView?

Log in with your username and password on the Pepperstone website. The Secure Client Area section contains accounts with which you can log in on various platforms. If there is no account here with the TradingView value, then click on the Request an account button.

In the appeared window, select TradingView in the Platform Type and click the Submit button.

After that, log in to the broker through TradingView using your email and password for Pepperstone.