[Plugin: Post UI Tabs] CSS Problem

Hi! Thx for the plugin is really good; but ive some problems:

i wanna use my own skin that ive create on the ui tabs website, but it won’t work. First of all i tried to use the code that i found in the other post, when someonelse asked how to replace the css and it didn’t work. Then i tried to replace just the css with mine but didn’t how to apply it.
So i’ve the folder downloanded from ui website, inside it i can see 3 folder js css and dev. I suppose i should use just the css folder, so i tried to put the path of the folder in the cose like: /wp-content/uploads/skin/nameofskin. but nothing work. this is the code i’ve added:

// Change the PUT skin directory
add_filter( 'post_ui_tabs_dir', 'put_custom_skin_dir' );
function put_custom_skin_dir() {
   // This is equal to https://yoursite.com/yourskins
   return get_bloginfo( 'wpurl' ). '/wp-content/uploads/wp-ui/extraskin/';
}
// Update the skins array
add_filter( 'post_ui_tabs_skins', 'put_custom_skins' );
// Note: The name refers to the name of the custom skin's folder
function put_custom_skins() {
   return array( 'extraskin');
}

this is my folder

imageshack

thx for your help
https://www.ads-software.com/extend/plugins/put/