Open a trading account with a broker and move on to the second step below. For opening a trading account you will need your email and password first. The sign up is very easy to do. After that, you get access to the platform in practice mode. It is possible to test every function for free and without risk.
If you want to trade with real money, you should complete the account application. The broker will show you what you have to fulfill. It is important to verify your data and identity because the platforms are regulated. There is a high standard for security and anti-money laundering. Upload the requested documents and fill out the questions. After that, you can start trading.