brackets in a quote

0 I'm quoting a source that already has brackets. I want to change the wording in the brackets back to language that more closely matches the original source. (Rules of the assignment are that I must quote the source I was given.) So I guess there are two questions: (1) If I leave the quote as-is, how will the reader know that the bracketed language was changed by the source that I'm quoting and not by me, and (2) If I change the language in the brackets, how do I let the reader know that I didn't just misquote my source, but instead made a change purposely?02br
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00Thanks much! 0-