help with using urbangiraffe redirection plugin?

does anyone here know how to configure the settings of this great plugin so that I can do the following:

lets say my blog is http://www.myblog.com

but that there occasionally will be links on the blog that are like http://www.kasamba.com/psychic-reading/

when people click those links I want them instead to be taken to:

http://www.kasamba.com/aff?2343

anyone here have a clue?