How do I Install Adsense Plug-In,Stuck

I am trying to take my file that says adsense-delux.php and put this into a directory. So I go into my blog, Click on Plug-in tab, It says at the bottom of my screen this:

To install a plugin you generally just need to upload the plugin file into your wp-content/plugins directory. Once a plugin is uploaded, you may activate it here.

Am I suppose to go to www.remarpro.com and copy/paste into Plug-in or what? Below I copy/paste from the readme file, but I don’t understand where I should copy/paste this adsense-deluxe.php file that I downloaded today that says, I can use this to copy/paste my adsense code into. All that it says on Adsense tutorials is how to use it in html ,not in php. If someone can give me some insight how to install this adsense plug-in, I would appreciate that, Thanks. p.s- I went into WordPress Database Plug-In and clicked on Adminstrative tab, But am Still Lost.

Installation
————
* Copy the following files to the appropriate locations:
/wp-content/plugins/
|
+- adsense-deluxe.php

* Go to the WordPress plugins admin panel then activate the Adsense-Deluxe plugin.
* Goto WordPress Options then select “AdSense” from the Options submenu to configure adsense blocks.

===[ WORDPRESS 2.0 INSTALLATION NOTES ]===

This section only applies ( !!!! ) if you’re using WordPress 2.0 and want a popup menu for your Adsense Ads in the Rich Editor (WYSIWYG/tinyMCE). NOTE: You can disable or enable the “Rich Editor by going to “Personal Options” in your user login profile (look for “Use the visual rich editor when writing” checkbox).

If you’re using WordPress 2.0 or later and insist upon editing Posts and Pages using the (WYSIWYG) Rich Editor feature (I recommend against it), you can install the QuickTag item with the following process:

– Inside the directory “Optional_WordPress_2.0_Items” is a directory named “adsense_deluxe”. Upload “adsense_deluxe” directory to your TinyMCE plugins directory on your web server: /wordpress/wp-includes/js/tinymce/plugins/

(DO NOT UPLOAD THE “Optional_WordPress_2.0_Items” DIRECTORY; IT MUST BE THE DIRECTORY INSIDE OF IT!)

– [If and ONLY IF you performed the previous step AND are using WordPress 2.0] edit the file /wordpress/wp-includes/js/tinymce/tiny_mce_gzip.php as follows:

— Add ‘adsense_deluxe’ to the plugins filter line. It should look like this:
$plugins = apply_filters(‘mce_plugins’, array(‘wordpress’, ‘autosave’, ‘wphelp’, ‘adsense_deluxe’));

— Add ‘adsense_deluxe’ to the button filter line. It should look like this (if you want the button to appear somewhere else, move it):
$mce_buttons = apply_filters(‘mce_buttons’,