Use the up/down arrows to locate the 'Radio' menu button (1), tap it and then you'll be able to see the list of the radio stations (2) that your carer or family member has setup for you.
Press 'Up' or 'Down' arrows to view the other radio stations then tap on the station to play. You can either tap on another one to play it or tap again on the station button to stop playing.(1) Radio Menu Button(2) Radio Station List
It is not possible to listen to the radio using BigPurplePhone Talk&Text Edition.