(It made me smile to see the example noted below follow so closely after the suggestion to use "proper spelling, punctuation, and grammar"

#3 reads, "3. In addition to the above 'rule', try to use proper spelling, punctuation, and grammar as much as possible. We can't help you unless you get your message across. Look! You can even edit your message after you post it, rather than posting twice again and apologizing for your mistake, etcetera, etcetera."
"twice again" is redundant.
If the meaning is to post a second time, perhaps it would be better to select either "twice", or "again" (but not both words).
If the meaning is to repeatedly post twice, perhaps a comma would help clarify, i.e.: "twice, again".