To edit the post, you need to get into the NC Post Processor utility:
Applications > NC Post Processor
On the left side is a list of directories that list the available posts.
I suggest you put the post you want into your own directory; you can do that by setting gpostpp_dir to a directory in config.pro. For example, I have:
! ProNC post processors
The default directory is C:\Program Files\proeWildfire 4.0\i486_nt\gpost\. Go there and copy the post you want to your own directory.
For the TM-1, the Haas VF8 post should be pretty close; that's the one I used to start the post for my MiniMill. Though, you might have to tweak a few things to get it all right. Before you begin to rely on your post, you should probably test it thoroughly. Make sure all the G codes and M codes do what they are supposed to; I had the incorrect check box for G18 orientation selected and the post would output XZ arcs the wrong way (i.e. in CW instead of CCW).
Next, to use your post inside ProE:
MFG Setup > Workcell > New
Give the workcell a new name (HAAS_TM-1) and enter the pertinent information. In the Post Processor Options area, enter the name of the post. It's shown at the top of the NC Post Processor utility when you have the post open for editing. Usually, the PP Name box is "UNCX01" and the ID box is the digits from the suffix; if you use the bundled VF-8 post, it is probably "11".
Once you've got that, be sure to hit save. That way, you can pull up this workcell (i.e. aka the milling machine) without having to enter all the information again.
Hope that helps,