It's somewhat hidden, since it's not in the section explicitly marked as installation. One of the first lines in the readme file says:
Before doing anything: Install needed controls (run Setup.bat of that folder).
There should be a directory in your dmmod folder that's named NeededControls. There's an install.txt file that will tell you what file to open in there (setup.bat).
After running that file, try following the instructions in the readme again.