This has already been asked several times, and here's how it goes
1st
Create a page, eg page1.php, and put it in templates/myteme folder.
Page content goes like this
<?
$includes[content]="
eg "my funny games"
";
?>
2nd
Open includes/modules.php and find this line.
$module['home'] = array("Welcome To $settings[site_title]!","templates/$settings[template]/home.php",0);
Below this line create a new line such as this.
$module['page1'] = array("Welcome To PAGE1","templates/$settings[template]/page1.php",0);
That's it!
$module['page1'] = page id
"Welcome To PAGE1" = page title
templates/$settings[template]/page1.php = path to the page & page name
number at the end
0 = means the members and guests.
1 = if only for members.
7 = if only for the administrator.
If you want to add a new page in the root of the script or for example members folder, just change the path to page1.php.