They have an online submission system here.
The closing time for comments is 5pm eastern time tomorrow, (Friday, October 23).
NOTE: You will have to download and install the Citrix client that is on the same page just to the upper right of the "start submission process" box.
It seems that I will have a little leg work ahead of me, I tried to start the process for a Mac computer and the Citrix site is telling me that "the content that I have selected can not be found.
I'll look into it tomorrow.
As far as you all know, do I have to use Citrix or can I just e-mail the comment to the address at the bottom of the Comment Form?