For 3rd edition, you have to create a registration resource file and it must be copied in \private\10003a3f\apps -directory of the device (or emulator).
Here's bldmake/abld-specific directions:
For emulator it is enough to specify the copying in the .mmp-file:
and minimal reg resource file (myapp_reg.rss) would be something like:
START RESOURCE myapp_reg.rss
If you create a .sis-file, the copying must be specified also in the .pkg-file.
UID3 0xDEADBEEF // Your app's UID3 here
app_file = "MyAppName";
BTW. It seems that there's no proper introductory tutorial for basics (build process, running etc) for 3rd edition.