Help installing pgplot....

I know I'm missing something very obvious...I'm trying to get pgplot installed on my mac. I've just installed macports v. 1.5, and completed the self-update. Now the directions for installing pgplot list the following: cd /opt/local/bin/portslocation/dports/pgplot sudo port install However, I'm missing the directory!! Obviously, I missed a step, but could someone please let me know what it was? Thanks!