washing machine not spinning, draining, taking enough water ?

I have had to strip the soap dispenser to clean it and I'm unsure which hose fits on the top of the valve magnet inlet. Is it the prewash dispenser I or is it the main wash dispenser II?
The washing machine is not taking on enough water, draining or spinning properly, i suspect this maybe the belt that needs tighting as there are various noise coming from the machine.
Is this correct and can the belt be tighten?