How do I change seat assignment?

I have an itinerary saved and hope to purchase the tickets tomorrow. On two of the trains, I have reserved seats for my husband and me. I was automatically assigned the seats and was not asked what type of seats I wanted. I had looked at the seating option chart on the website. I was assigned seats that I do not like. How can I change the seats to the type I want(Club 2 Seat) before I purchase the tickets? Thank you.
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