I referred to your profile and see that you have Kenmore dishwasher model 665.16033400.
The image below shows how to access the filter and sump area of your dishwasher.
Turn off the breaker to completely disconnect electrical power before beginning this procedure.
Use the procedure below to disassemble the dishwasher to access the accumulator filter at the bottom of the dishwasher tub. The entire procedure below provides access to the chopper assembly in the sump. You may not need to precede this far in the process. Only go as far as needed to access and clean the filter that you are referring to in your question.
If you need more help (or you are trying to get to a different component), resubmit your question with additional details.