Get the trade screen up, just as if you were to negotiate a new deal. Look for the text saying "Active" in the middle pane and click on it.
It will show a list of all active trades. Some of them have a number in paranthesis, thats the number of turn left of the 20-turn deal (The answer to your last question).
Those that don't have this number can be cancelled/renegotiated. Click on such a trade, and the trade will be renegotiated, and you can cancel it.
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If you cut off my head, what do I say:
Me and my body or me and my head?
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