To convert your Joy Points on any device, you just need to log in and click the three lines in the top left-hand corner to open the Menu and go to My Account> Convert Points.
On all devices you'll see the total Joy Points balance and the 'slider' to convert them. Click on the slider and drag it to the right to choose an amount to convert and then click 'Convert now'.
The cash equivalent of the Joy Points that you will convert will go straight onto your balance to enjoy! For example, convert 50 points and you get 50p to play with.