Some designs feature custom HTML buttons. You have the option of using the HTML buttons or should you prefer, you can remove them and use the google buttons.
*****IMPORTANT******
You must update the buttons when you launch your site! They are not linked to your website internally like the google buttons are. To link them - Published your website once you have connected your domain. Go to the selected page that you want to link and copy the url. Paste the url in the link section of the HTML.