You can upload a star image into your Media Library and then insert it into your tip of the day posts. You can enable star ratings > http://en.support.wordpress.com/ratings/ But you cannot upload a plugin. There is no FTP access to free hosted WordPress.COM blogs like the one linked to your username and we cannot install individual plugins. Those found on the internet are for WordPress.ORG installs which run on different software.
If you have any theme issue you need support for note your theme is a premium theme and we Volunteers answering questions on this peer forum have no access to premium themes and no knowledge of how they are designed to operate. When you purchased your premium theme what came with that purchase was support directly from the theme designer in the Premium Theme Support Forum. There is a link for the specific Premium Theme support forum under Appearance -> Themes in your blog’s Dashboard, bu