(See attached image)
Go to Project > Options. Go to the Directories category and in the "Project" block youll see Configuration Files. This is where youll enter the path for your EDS files. All EDS files should be in this directory. Then go into PLC Configuration (in the resources tab) and right click the CAN bus that you wish to use CANopen on, and select append subelement --> CANopen Master. Right click the CANopen Master and append subelement. The EDS file should be located in that menu since it brings up items from the Configuration files directory.