How do I get to the diagnostic blue connector for Check Engine Light?

What is your question?

Dear Repair, I have a high mileage 1991 Honda Accord and it all of a sudden started losing 1/2 of it's power after it warms up. We replaced the distributor, but still no improvement. Check Engine Light stays on constantly. After replacing the distributor, car runs very rough at low idle. How do we get to the Diagnostic Connector on the Passenger side to run a diagnostic code?

What makes this problem better or worse?

Runs rough all the time

How long has your 1991 Honda Accord had this problem?

A few months. Car hasn't moved