Thumbnail Post Not Showing

Hello Everyone. It is enabled currently in my theme Florance.
The code of function (excerpt only)

function new_excerpt_more($more) {
return ‘*a href=”‘. get_permalink($post->ID) . ‘”*’ . ‘ [ Read More ]’ . ‘*/a*’;
}
add_filter(‘excerpt_more’, ‘new_excerpt_more’);

if ( function_exists( ‘add_theme_support’ ) ) { // Added in 2.9
add_theme_support( ‘post-thumbnails’ );
add_image_size( ‘flr_slider’, 640, 220, true );
add_image_size( ‘flr_home’, 360, 150, true );

**I changed the < and > with * (just for this post)

However, IT DOES NOT APPEAR on the Edit Posts, or even new posts. Help Me? 🙁