ZenCart footer

How to make modifications in the footer?
i have researched that i have to go to this path:
open includes -> templates -> template_default -> common -> tpl_header.php
however i have the dummies question:, i don't know how to go to this path in the admin ZenCart. sorry this is my first time working with zenCart. and someone else built this site.
all i want to know is how to delete a link from there.
i have gone to TOOLS > Page Editor > and it is not there

Please advise me here. thanks a lot in advance.
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