image size

First off, I love this plugin, and have this just about how I want it.

I followed the instructions here to add the featured image
http://ww.wp.xz.cn/support/topic/how-to-add-featured-image?replies=27

Is there an option to edit the size of the image shown?

Thanks.

http://ww.wp.xz.cn/plugins/posts-in-page/