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Why do you assume we all know what check mark you are talking about?
Mariano, my guess is that the OP is looking for the tick mark to "accept" comments that were made on his first, off-topic, question.
cjsh716: please read the FAQ for MathOverflow, with particular attention to what questions MO is intended for.
cjsh716, no "answer" was given to your question, which is why you cannot accept an answer. What you received were comments, which are distinct from answers. None of this is relevant to the fact that you have asked a series of unclear, poorly worded questions that seem not to be on-topic for this site.