3 issues.. please help

Hy guys it's a long time I don't write here, but now I need your help.
I have 3 issues, this is my site: www.coldplayzone.it

1) There is not anymore the shadow around the article's images.

2) I really don't understand how to edit the K2 tag list page. Here an example: http://www.coldplayzone.it/index.php/ne ... let%20hill
I would like to separate with more space the articles, insert a border line in the bottom... but in which css file?
If I look this page with Firebug I see meyer.css but I don't understand how to use it.

3) In the control panel... if I delete 1 joomla article or 1 joomla category they go in the trash, then i go to the trash to delete them but I can't.

The template version is the last, and Joomla is 2.5.4 version

Please can anyone help me to solve these issues?
Thanks

Hi

2. Do not look for a specific css. Please just place all css modifications in override.css file, just remember to allow using of this file in template settings.

1. Can You show me what You have in mind ?

3. It can be because of user permissions, please check if Your user is allowed to delete items.