>>8
I alrady did, although there's many ways depending on what you want to do. If you're writing an asdf library(system) yourself, consult the documentation on how to set up dependencies (it's simple enough, here's a small tutorial:
http://xach.livejournal.com/130040.html), otherwise you can load it via SLIME using ,l (type those keys in the REPL), or by doing
(asdf:oos 'asdf:load-op '#:system-name), then doing
(use-package '#:the-package-name). Of course, if you don't have it installed, it means you have to copy or link the project files in the right path (depends on how you set up ASDF, this is very user/OS-specific and you usually have to add a line or two of code as to where/how it loads stuff; if you're too lazy to do that by yourself, you can use quicklisp or something similar which does it for you).