How can I fix my Zanussi WDT 1085 Program selector knob?

I'd be really grateful for any help! I have a Zanussi WDT 1085 washer dryer. Yesterday I went to set it to a spin cycle and the programme selector knob broke. Knob still worked, but the dial around it came loose so that it selects the wrong program. Now it's full of water and I'm nervous to set it to the spin cycle as there are dryer cycles on either side ! Anyone know how to realign the knob? Thanks very much.

Hannah
September 2016