CommunityAuth

Instruction (3) is telling you that since you are on Windows, skip to step (4).

(4) Copy MY_Controller.php, MY_Input.php, and MY_Model.php from community_auth/core to CodeIgniter’s application/core directory.

(5) Copy auth_constants.php from community_auth/hooks to CodeIgniter’s application/hooks directory.

(6) Copy the Examples controller in community_auth/controllers to CodeIgniter’s application/controllers directory.

(7) The .htaccess file in community_auth/public_root can be moved to CodeIgniter’s public root directory. Notice the lines at the top that allow for access denial. If you already have an .htaccess file, make sure to include those lines at the top of it.

What about these steps (4 through 7) do you not understand?

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Community Auth For CodeIgniter 3