Please let me back into my older posts to make corrections!

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As I peruse my older material, I'm looking in vain for an opportunity to go back into these and correct embarrassing typos! Can Mylot.com make it possible? Maybe it is already possible, but I don't know how to go about it. I am especially prone to screwing up my photo captions. It appears that once you "submit," it's over, and your error remains in cyberspace for as long as there is a God. Can this be changed? I'm begging here.