How do I set the page title?

You have a few choices of setting the page title for your template.  You can
keep the title static and avoid processing, or you can call the following
variable:

<title>#$tpl:pagetitle#</title>

This variable looks for a module to override the pagetitle, and if there is
an override, display the title.  If not, it will display the preference that
you set in your base configuration.