If you have a Flickr account and want to share a set you have created, you just need to get the set's id. It's the last part of the URL for the Flickr page (i.e. http://www.flickr.com/photos/27747697@N05/sets/72157605676665251/). Copy/paste the ID (red in this example) into the template like so:
==== Subtitle your gallery on this line ==== Type your description here... (multiple lines are OK) ==== If this is a Picasa Webalbum, replace this line and paste in your embed code from Picasa ==== If this is a Flickr Photoset, replace this line with your photoset id number
==== My Flickr Photoset ==== My Flickr description goes here! ==== If this is a Picasa Webalbum, delete this line and paste in your embed code from Picasa ==== 72157605676665251
Note that all of the images in your Flickr Photoset must be viewable by the public, or none of your pictures will display.