Off-topic reply. Presumably the user of your proposed tutorial is going to have Mathematica at his/her disposal. So wouldn't it be much more useful to create the tutorial in the form of a notebook where the user can directly try things, inserting new code, etc.? Or, at the very least, put essentially the same things into a notebook as are on the blog/forum.

What David Reiss wrote is quite on target. In addition, you might want to cite or at least mention the software used in situations where others might be interested to know that information. But it is by no means required by the license, it is simply a courtesy to readers in situations where you have reason to believe they might wish to know that.

The internet forums may have their own requirements beyond the usual academic/authoring ones David noted, and what I note above might or might not also apply to those.

Well, thank you, Mr. Reiss.

The problem is that, as I read in the Licence Agreement, "When publishing academic or research papers for which Mathematica was used, the Product should be appropriately cited as a reference and/or described in a methods section."

But a forum tuto is not really an "academic or research paper"... So I wasn't sure.