I use Lightbox to show a larger photo at my photolog. Photo-Biyori has Lightbox code in it and below is how you can use it.

You still need to find a Lightbox Plugin for Wordpress, though. I tested with:

Lightbox 2.0 for WordPress
WP lightbox JS WordPress Plugin

They work fine with the Photo-Biyori. There are many other Lightbox plugins and any of them should work if it uses rel="lightbox" in the image tag.

Once you install and activate a Lightbox plugin, go to Options > Photopress and change the settings:

Update options.

Prepare an image with the size that you want it to show in the Lightbox window and upload it with the PB-Mods Photopress. When you instert the image, it should insert the code something like below and show the larger image (originally uploaded image file size) when the main image clicked:

<a href="http://xxx.com/wp-content/photos/orig_xxx.jpg" rel="lightbox" title="xxx"><img src="http://xxx.com/wp-content/photos/xxx.jpg" title="Click for a larger version." /></a>

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