You can also make these changes via Child Theme. Sample Dazzling Child Theme can be downloaded from here.
Once you have downloaded this sample Child theme make sure to install it and activate. Then create a clean file inside Child Theme folder and name it front-page.php or copy/paste existing file from Parent Theme folder to Child Theme folder. Then just copy above mentioned code inside this newly created file and you are good to go. This modification will replace default front-page.php template and it will also be update safe.
Let me know if you have any other question.