Dishwasher

Dishwasher started making obnoxious noise and it has gotten louder and louder. Dishes get cleaned but noise is almost unbearable. I decided to just start taking stuff apart and found a screen that sits vertical below the bottom spraying do-hickey. It has some sludge on it which I tried to get to with a toothbrush and got some, but I couldn’t figure out how to get to it other than through the small opening in the top. when I restarted the washer it was still loud but not as much. I figure if I can get to the screen I may be able to take care of the noise. Can someone give me the way to get to the screen?
Thanks