Just put the footnote in between the tags , directly after the statement in the article.  Then, at the bottom of the article, the footnote will show up wherever you have .  For example, this 
Bla bla bla.  This is a fact.Doe, John (2004).  "Source." Retrieved on 1 March 2009.

===References===
{{reflist}}
yields the following:
Bla bla bla.  This is a fact.Doe, John (2004).  "Source." Retrieved on 1 March 2009.

References

By the way, have you gone through the tutorial yet?  talk/contribs