English term (edited): address (here)

It means "please fix (take care of, do something about, etc.) each error."

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Note added at 2 mins (2011-02-27 02:58:46 GMT)
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Other synonyms: "correct" & "deal with"

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Note added at 9 mins (2011-02-27 03:05:49 GMT)
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I would say that "address or apply oneself to something, direct one's efforts towards" is the applicable definition in this case. The idea is to address your efforts towards correcting the error(s).

Hope that helps!

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Note added at 2 days1 hr (2011-03-01 04:31:18 GMT)
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Just a note...I'm not suggesting in any way that the definition of "address" in a vacuum isn't sometimes different from what I've suggested. I think langclinic's question itself was a reflection of the variety of possible definitions, and of the ambiguity of the term. English speakers do not look up terms in dictionaries before selecting them, and dictionaries merely try to keep up with living usage. In this case, the dictionary definitions that Google provided were not nuanced enough to cover the meaning conveyed by the sentence, no matter how forcefully one might point to these definitions.

In my opinion, the only reasonable way to interpret the term in this context, where one is being asked to address the errors on an Internet form before the computer will allow that form to be submitted, would be as a synonym for "fix" or "correct." Here, fully "addressing the error" can only mean "making the error go away," which is another way to say "correcting the error." There is no in between, and the computer will not recognize you as having addressed the error unless you eliminate the error altogether.

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Note added at 2 days1 hr (2011-03-01 04:46:54 GMT)
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To those who are obsessed with dictionary definitions, my explanation actually does show up in the OED as definition #8 for "address": "To right what is wrong; to redress (wrongs), reform (abuses)."

Even if I hadn't found this definition, however, I would still insist that "address" is being used in this context as a synonym for "correct" or "fix." Clearly, the author is asking the reader to make the mistakes disappear.