We need the 3D files of your robot (preferably STEP or IGES files) to add it to RoboDK. It would also help if you can provide a PDF sketch with dimensions and robot related information (payload, reach, etc).
This model is a standard FANUC model, you cannot modify it using LR Mate 200iC which is on RoboDK Robot Library? I provided the datasheet here, but I do not have the STEP models.