Adding Custom Links to the WordPress Plugins Page

Introduction

This is unfountunatly not a very well documented feature, so I thought I would include a quick guide here.

The Code

You just need to add an action hook and include an array of links:

add_action( 'plugin_action_links_' . plugin_basename( __FILE__ ), 'my_plugin_action_links' );
function my_plugin_action_links( $links ) {
    $links = array_merge( array(
        '<a href="' . esc_url( admin_url( '/options-general.php' ) ) . '">' . __( 'Settings', 'textdomain' ) . '</a>'
    ), $links );
    return $links;
}

You can change '/options-general.php' to be a relative link to your desired page and you can also change 'Settings' to display another string of text for the link title.