how to use Quartus ,modelsim and synplify pro Quartus, modelsim, pro, synplify, use

junjie200801

怎么在quartus 调用， modelsim and synplify pro.网上说的 我都试了，老说我Error: Can't launch the ModelSim software -- the path to the location of the executables for the ModelSim software not specified.

thank you !