Instructions aren't clear

[tasinone]

I am using infinityfree.com for hosting, so how do I install WhichBrower? If I can't install this then still can I see other information? Or the whole plugin will not work?

The following Instructions aren't clear, please tell us in detail.

Change to what?
It is possible that you will have to change the path of vendor/autoload.php.

Provided one! Which one?
If you use version 2, make sure to also replace /includes/functions.php with the provided one.

[Tiande]

when we use composer require ..., it installs files we need under somewhere.

Edit plugin.php Line 12 require 'vendor/autoload.php'; to the exact location.

For me, it's require '../includes/vendor/autoload.php';