You ________ post and edit your threads.

[riverkid]

It must be that this is what you were doing on the day they taught the actual differences.

[Torben]

You can post new threads. (Sure about that?)

Well...I may post new treads, but my internet connection is down, so I can't post new treads.

[SUDHKAMP]

You may post new threads
You may post replies
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You may edit your posts


Who thinks it's incorrect to use "can" in place of "may" in the above sentences?

Anyone?

I don't.

Try this sentence and situation:-
A student at Prinicpal's office entrance asking for permission,
May I come in or Can I come in.

A boy proposing to a girl:-
May I hold your hand or Can I hold your hand.

So, the may is always used where some kind of permission or consent is reuqired from another person while can is used for the potential to do certain act.