-> Installation Instructions
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// Open wp-content/plugins folder

Put:
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print.php
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// Open root Wordpress folder

Put
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wp-print.php
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// Activate the print plugin

Note: 
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You MAY Need To Re-Generate The Permalink.
Options -> Permalinks Options -> Update Permalink Structure
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// Open wp-content/themes/<YOUR THEME NAME>/index.php

Find:
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<?php while (have_posts()) : the_post(); ?>
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Add Anywhere Below It:
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<?php if(function_exists('wp_print')) { print_link(); } ?>
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Note:
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The first value you pass in is the text for printing post.
The second value is the text for printing page.
Default: print_link('Print This Post', 'Print This Page')
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