Please note that your community will not have a password associated with it. It is no longer possible to log into community accounts; all administrative tasks can (and should) be done from the maintainer account. Because of this, newly created communities do not have a password associated with them, and so cannot be logged into.
That is "no password - can't login". Correct me, if there's any major and important difference. :) I didn't use the last sentence, when translating this FAQ into Russian.