Your first step is to choose PrimeBit Ltd. as your broker.
Choose “Connect with an existing trade account” and log in with your app.primebit.com account. In MetaTrader5, 'login' is your account number and 'password' is the same that was used for registration on PrimeBit.com.
You see three main windows:
Depth of Market
Market Watch, where you can choose any symbol, right-click at it and choose what you would like to display
The “Chart Window” for BTCUSD is already there for you. As well as the “Depth of the Market” window on the right.