1. Go to the admin panel by adding wp-admin to the site domain string
2. Go to the main WordPress menu by clicking on the Wordpress logo. In the menu, go to the Appearance - Editor section. In the menu, go to the Appearance - Editor section.
3. In the theme editor, open header.php (header).
4. In the header.php (header) edit box, paste the button code (detailed instructions in the article) and click Update file.