Download the appropriate otrunk-ide from here:
http://otrunk.concord.org/eclipse/

Download the the LOOPS project set file here:
http://svn.concord.org/svn/projects/trunk/common/java/otrunk/otrunk-examples/LOOPS/eclipse/loops_project_set.psf

Watch this video to get you started:
http://screencast.com/t/SKj1epUu

keywords: loops authoring

Adding LOOPing to activities

Adding LOOPing