For each molecule type you should have a file describing molecular structure and parameters of the force field. Other lines contain parameters in free format. Each line contains 8 parameters. Next line contains number of lines for reference to the force field for the molecule, followed by lines with the reference itself. The first line is number of bonds.
Next lines contain parameters for each bond.
F. Other parts are optional. They begin from the line defining type of extra potential. This utility automatically generate lists of angles and torsions from the bond list and substitute parameters from the force field database. Before compiling, you may need to change sizes of working arrays defined in file dimpar.h. There are several versions of this file creating executables of different size.