On installed MT5, there is no XAUUSD symbol. What should I do?
How to find the broker?
Find a Server by the Broker's Name
Another convenient new feature of MetaTrader 5 is adding brokers' servers by their names. With the previous version, you had to contact your broker to find out the IP address of the trade server or download a special client terminal. Now, you simply enter the name of the broker. The system automatically finds the server with the specified name and adds it to the list.
And how to open demo accounts with the brokers (to select the symbol you want to trade/use):
MetaTrader 5 Help - Open an Account
MetaTrader 5 Android OS Help - Opening a Demo Account
MetaTrader 5 iPhone/iPad Help - Connecting to an Account and Opening a Demo Account
Simplified way to request a real account in MetaTrader 5 Android
And this is my Metatrader (as an example) -
Ask your broker.