That depends entirely upon WHERE on the page you want it to appear, and what this script needs to do to display the text. The page is divided vertically into a header and footer, with one or more sections in between. You will probably be modifying index.php and the index_body.tpl template file.
I suggest some time spent in the Knowledge Base here (Support link above), studying the articles on the template system and making modifications. There's also a MOD Writer's Discussion area here.