Hi @whitsnow,
You can redirect your site to just go to one journal in the settings: Learning Open Journal Systems 3.3 - Site Administration
However, even if you do that, you still might be required to have a path, as OJS needs to identify your journal using the path, unless you do some configuration on your server for your path, such as what is outlined here: Please, How To Direct Single Journal To Web Root (http://journalpage.com) instead of (http://journalpage.com?index.php/ojs) - #48 by drugurkocak
-Roger
PKP Team