Could you link the pattern? Â I looked on ravelry and I saw several hats with Amanda in the title, but none of them were lace, so I don't know what hat you are doing. Â
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For the "3 times, 12 rounds total", probably this instruction comes after instructions for 4 rounds, and it would mean to repeat those 4 rounds 3 times, which is a total of 12 rounds. Â Hard to say for sure without seeing the context though.
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How do you do lace pattern - if the pattern is telling you to "do lace pattern", then there is probably a section at the beginning or end of the pattern that gives instructions or a chart for the lace pattern. Â