Well the feature IS there, just harder to find, like many things in the new layout. What you have to do to access it, is:
1) activate the "View Forums" link on the home page (cs.finescale.com)
2) then activate the "Your Discussions" link. If necessary you can then click "View More" and also dectivate the option "Newer Than 2 Months" to see also the older posts.
Hope it helps, have a nice day
Pawel