Reply To: Increase number of portfolio thumbnails per page.

[livemesh]

The child theme is already included in the theme download bundle. You just need to upload it and activate just like any other theme. You can learn a little bit about the basics of Child theme here –

http://wp.tutsplus.com/tutorials/theme-development/child-themes-basics-and-creating-child-themes-in-wordpress/

and some more from

http://codex.wordpress.org/Child_Themes