By tapping on Exchange at the bottom of the screen you’ll see four currency conversion options, using Pound Sterling (GBP), Bitcoin(BTC) or Ether (ETH).
You can exchange BTC/GBP, ETH/GBP, BTC/ETH or ETH/BTC. Tapping on any of these options will take you to a price chart indicating current pairing prices, and by tapping the Exchange button you will then be asked to input the amounts for the currencies you wish to exchange.
After doing this and tapping Next you will be taken to the final page which confirms the transaction plus all associated fees. If you're happy with everything just tap on the blue Buy now button to finalise the transaction 👍
Below is a short clip on how to do exchange crypto.