If you want more control, you can make a module. You'll have to make a plugin with 2 files : 'qa-plugin.php' and 'qa-mypage.php'.
In 'qa-plugin.php' you'll have to add this :
qa_register_plugin_module('page', 'qa-mypage.php', 'qa_mypage', 'My Page');
The details for the rest are explained in the link jatin.soni gave :