The Ask/Bid spread for a particular trading pair can be viewed within the Order Book on the Trading Screen.
To view the order book in full screen, click the green circle in the top right corner of the book.
What is the Spread?
The Spread represents the difference between the highest buy order (Bid) and lowest sell order (Ask) for a particular trading pair on the exchange. It is displayed in between the Ask and the Bid sides of the Order Book.