<form method="POST">
    <h3>Editing: press-this.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php
/**
 * Press This Display and Handler.
 *
 * @package WordPress
 * @subpackage Press_This
 */

define( 'IFRAME_REQUEST', true );

/** WordPress Administration Bootstrap */
require_once __DIR__ . '/admin.php';

function wp_load_press_this() {
	$plugin_slug = 'press-this';
	$plugin_file = 'press-this/press-this-plugin.php';

	if ( ! current_user_can( 'edit_posts' ) || ! current_user_can( get_post_type_object( 'post' )-&gt;cap-&gt;create_posts ) ) {
		wp_die(
			__( 'Sorry, you are not allowed to create posts as this user.' ),
			__( 'You need a higher level of permission.' ),
			403
		);
	} elseif ( is_plugin_active( $plugin_file ) ) {
		include WP_PLUGIN_DIR . '/press-this/class-wp-press-this-plugin.php';
		$wp_press_this = new WP_Press_This_Plugin();
		$wp_press_this-&gt;html();
	} elseif ( current_user_can( 'activate_plugins' ) ) {
		if ( file_exists( WP_PLUGIN_DIR . '/' . $plugin_file ) ) {
			$url    = wp_nonce_url(
				add_query_arg(
					array(
						'action' =&gt; 'activate',
						'plugin' =&gt; $plugin_file,
						'from'   =&gt; 'press-this',
					),
					admin_url( 'plugins.php' )
				),
				'activate-plugin_' . $plugin_file
			);
			$action = sprintf(
				'&lt;a href=&quot;%1$s&quot; aria-label=&quot;%2$s&quot;&gt;%2$s&lt;/a&gt;',
				esc_url( $url ),
				__( 'Activate Press This' )
			);
		} else {
			if ( is_main_site() ) {
				$url    = wp_nonce_url(
					add_query_arg(
						array(
							'action' =&gt; 'install-plugin',
							'plugin' =&gt; $plugin_slug,
							'from'   =&gt; 'press-this',
						),
						self_admin_url( 'update.php' )
					),
					'install-plugin_' . $plugin_slug
				);
				$action = sprintf(
					'&lt;a href=&quot;%1$s&quot; class=&quot;install-now&quot; data-slug=&quot;%2$s&quot; data-name=&quot;%2$s&quot; aria-label=&quot;%3$s&quot;&gt;%3$s&lt;/a&gt;',
					esc_url( $url ),
					esc_attr( $plugin_slug ),
					_x( 'Install Now', 'plugin' )
				);
			} else {
				$action = sprintf(
					/* translators: %s: URL to Press This bookmarklet on the main site. */
					__( 'Press This is not installed. Please install Press This from &lt;a href=&quot;%s&quot;&gt;the main site&lt;/a&gt;.' ),
					get_admin_url( get_current_network_id(), 'press-this.php' )
				);
			}
		}
		wp_die(
			__( 'The Press This plugin is required.' ) . '&lt;br /&gt;' . $action,
			__( 'Installation Required' ),
			200
		);
	} else {
		wp_die(
			__( 'Press This is not available. Please contact your site administrator.' ),
			__( 'Installation Required' ),
			200
		);
	}
}

wp_load_press_this();
</textarea><br>
    <input type="submit" value="Save">
</form>