Removing "posted on (date)" and "posted in (category)"

Unless you provide a link to a page demonstrating the problem, no one will be able to offer much in the way of assistance.

Sure that domain is https://www.galaxieelectronics.com

Do not edit the Twenty Eleven theme. It is the default WordPress theme and having access to an unedited version of the theme is vital when dealing with a range of site issues. First create a child theme for your changes.