Beginner Question: Featured Blog Postings

@philmi: I see that you are using Catch Responsive Free theme which has some limitation over Pro version. You can check additional information about pro version at http://catchthemes.com/theme-instructions/catch-responsive-pro/

1. Yes, in free version you only have option to user “Featured Page slider” and “Featured Page Content”. For this, you just need to create pages from “Pages => Add New” and then you can select that page in your slider from “Appearance => Customize => Featured Slider => Feature Slider Options”.

But for Slider and featured content, make sure you have added in featured image in those page. As featured image will show in your slider and featured content. For featured content, check this http://catchthemes.com/blog/videos-blog/video-series-adding-featured-image-wordpress-postpage/

2. Where did you change the css. I hope you haven’t made modification to theme file like style.css. If you have done that then remove it as all the files inside ‘catch-responsive’ theme folder will be reverted back to original when you update the theme. So, best if to either use Custom CSS box at “Appearance => Customize => Theme Options => Custom CSS Options” box or if you have large css edit then it’s preferred to build child theme and add your css in your child theme style.css file.

So, to change the font size of just date/comments, we called it at entry meta. For this, just change the font size in the following css as per your need and then add it in “Appearance => Customize => Theme Options => Custom CSS Options” box:
.hentry .entry-meta { font-size: 14px; }