Inserting silence in chains

I’m using 2.03 on osx mountain lion.

I need to insert 2 seconds of silence before a bunch of mp3s for batch processing. I can’t figure out how to insert a chain to do that. I read on some of the forums about using a nyquist script, but I haven’t figured out where to insert that either. Has anyone done this successfully with 2.03, and if so can you please let me know how.

File / Edit Chains / Insert

See here: