If you're in the first 20 turns, you can't do anything. If you're after that, go to the diplomacy screen for that civ and at the bottom right you should see the word "active". Click it and you'll see all active deals. Click the one you want to renegotiate and you can change the deal, or cancel it altogether (if, say, someone else can offer you a better price, or you lost your other source).
You may also want to go to the Preferences screen--there's a box you can check to prevent automatically renegotiating deals. That way, after 20 turns, you can renegotiate as you desire. By the way, there is a way to cancel a deal before 20 turns are up--go to war--but that will hurt your trading reputation.
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