Number 1:
It is possible to associate an existing article to an existing thread, this was meant to be fairly straight forward (so my apologies if it isn't).
There are really 3 pre-requisites for this
1) You must have the permission to associate articles to threads
2) You must make sure the category that you have added the article to has an associated forum (or you use a default article forum)
3) (you will find this out when you try to add the thread) You must make sure the thread has been moved into that associated forum
Simply put: If your article has been added to a category the does not allow threads, you cant associate it to an existing / new thread
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