Upon downloading the application, you can register with the same e-mail that you used for the FBS account (if you have any) or you can register a new account (if you did not have an FBS account before).
As soon as you are in, you can adjust the settings in your Profile and make an initial deposit. Kindly note that you can publish an account only if its balance is not less than $100.
The moment the funds reach your account, you can choose the suitable Trader and start copying him!
Take a look at this tutorial: