EDK 8.2 tool : simulator set up

Dear

I need to simulate my EDK (8.2) project.

Simulator is Modelsim SE 6.1c.

I did following steps:

------------------------------------------- In order to compile COMPXLIB,

I used the EDK simulation library compilation wizard

Project -> Project options -> HDL and Simulation -> Simulation library path

EDK library = C:/EDK/EDK_LIB Xilinx library = C:/Xilinx/Xilinx_LIB

-------------------------------------------

However, I could not proceed, because of the message "Modelsim is not found. Please ensure that the simulator is correctly installed and/or necessary environment settings are available".

Could anyone tell me "how to set up the environment" (or, how to points to the location of the simulator)? in EDK 8.2 ?

Thank you in advance