where i can find index.php?

[Jrald12]

where i can index.php on the default where i can edit og:image ? ive tried to open all index.php but all are blanks i want to find this on index.html to edit the og:image and others -> http://gyazo.com/df6dfa660c7e1e469a6f338c2ba90f56

[abantecart]

What you are looking for is not in index.php. This is located in the head.tpl template.
https://github.com/abantecart/abantecart-src/blob/master/public_html/storefront/view/default/template/common/head.tpl