Nokia 6103 Theme

[netibiza]

On my old Nokia 6103 which I use as a spare, I have selected the Ripple.nth theme which is awful but there is no way I can get rid of it. When I go into View all it gives is the details and no option to delete. OPlease kind clever people tell me how I can get rid of it. when I pres menu it's always there in the background and making everything hard to see. Thank you so much.