Empty it before buying.

Principle: For example, you are bearish on EUR/USD, but there is only USD in the account without EUR.

1) Borrow eur from the bank first, and the platform will use the US dollars in your account as collateral (that is, take up your margin) (how much will be taken up, depending on the platform's leverage).

2) After the bank lends you euros, you sell them first. When the euro/dollar exchange rate falls and reaches your winning price, you close your position, that is, buy the euro and then return it to the bank. The profit in the middle is yours.

3) The specific operation is to select a currency pair in the platform, and then sell, short, short and sell (all with the same meaning).

thank you