Here's some generalizations of where things could be:
site.com/avacardo
if there is a module that uses the module url 'avacardo' then the template that shows that page will most likely be
/modules/xxAvacardo/templates/index.tpl
But if there is no module then the template will probably be at
/skins/(YOUR SKIN)/avacardo.tpl
if the URL is on a profile then its probably controlled by a module, so if the url is
site.com/michael/avacardo
then the template will most likely be
/modules/xxAvacardo/templates/item_index.tpl
but that could have an over-ride template in place at the skin level, so if
/skins/(YOUR SKIN)/xxAvacardo_item_index.tpl
that will be over-riding the modules version.
if there is a number in the URL on a profile then you're likely not looking at a list, but at the DETAIL page of a single item, eg
site.com/michael/avacardo/24
then the template will likely be
/modules/xxAvacardo/templates/item_detail.tpl
but could have an over ride at
/skins/(YOUR SKIN)/xxAvacardo_item_detail.tpl
--edit--
ah yeah on that URL the template names is not so much help. What you have here:
https://example.com/forum/activity/10/username/p=2
is the forum module, so jrForum and the page we're looking at has another / after the module name so its most likely a function. the visibile functions are stored in the index.php file of a module, so
/modules/jrForum/index.php
is the file, then the function name is /activity/ so open that file and look for
function view_jrForum_activity() to see whats going on with the page.
updated by @michael: 07/27/21 03:34:26AM