mine is in /usr/bin/aterm
open a terminal and type:
whereis aterm
and it should list where it got installed to.
you can also download the .tgz file for aterm from
linuxpackages.net
and install it using "installpkg aterm*.tgz" as root.
either way, if it's installed, you should be able to run it from a run command or a terminal by typing "aterm" in either.