When creating a BTC Live Account, you are creating a Live Trading Account with the Bitcoin currency.
To create a BTC Live Account, you would need to choose the BTC as currency as shown in the image below:
The Live Account will be in BIT as shown below:
BIT is the sub-unit of a Bitcoin, 1,000,000 BITS are equivalent to 1Bitcoin (BTC). In comparison with USD currency, 1BIT would be equivalent to an approximate 1Cent of 1USD.