Hallo Tania!
I have started working with PD few weeks ago and I find it very useful for my work, but I am facing some problems in trying to load some libraries into PD. I want to add the Adaptive Filter library written by Markus Noisternig and Thomas Musil. I am working on Mac osx.
This library is included in the pd-extended autobuilds from http://autobuild.puredata.org/auto-build/ - there you can download the osx version.
Then you only have to start pd with "pd -lib libdir -lib iem_adaptfilt".
LG Georg