Creating a custom plugin to hide post date and category on s

My site is avelim .co.il. The site is on Hebrew wordpress 3.3, on regular browsers, the site uses the theme Weaver 2.2.6 with many customization done by programmers. On Mobile sites the site uses the Yoko theme with the mobile smart plugin. Under each post, usually, the category and publication date is displayed. I had a programmer create a custom plugin that enabled me to hide the category and date on certain posts, when I check a box under the posts. This work very well on the weaver theme but does not work on the Yoko theme. You can see an example at [login to view URL] .[login to view URL] If you click on the purple link at the bottom right you see the post in the Yoko theme. The project should be completed within 24 hours of being awarded the project. Work will be done on a test site, and when successful done on the live site A screenshot of the suggested admin panel of the plugin will be an advantage.