fop2_server
is not going to be run if /usr/local/fop2 is added to your system PATH (which is not). You have to run
/usr/local/fop2/fop2_server --register
or
cd /usr/local/fop2
./fop2_server --register
The email instructs you to use
/usr/local/fop2/fop2_server explicitely. So, follow those instructions and it will work.
