aavayro

Hello, i am new to forum and am in need of some help. I have a 2009 Bmw mini clubman diesel. a warning light has appeared on my dashboard and was told it the partical filter light, and the blood bag in boot wanted changing as was empty. I have recently fitted a new blood bag to the car but the warning light is still showing that the bag is still empty. How do i remove/reset the warning light ? The car is due for its MOT soon so i need to fix asap.. Thankyou