Before use, it is necessary to configure the currency. Choose the currency you need to use. This is to avoid wasting resources.
If you are using it for the first time, a dialog box will pop up after logging in, reminding you to configure it. Generally speaking, you can choose whichever currency you can use.

The base currency is mandatory. For example, if you need to use the USDT payment function of TRC20, the base currency TRX of the TRON chain is mandatory because TRX is required for collection.