I don't know the easy view hmi software.
But in general there should be an option where you can configure the IP address of your plc, and for S7 rack and slot number.
Example:
Your PC where Plcsim and Nettoplcsim is running has the IP address 192.168.1.10.
Then you have to configure this IP in your hmi software. Both devices should be in the same subnet, for example 192.168.1.20.
First step is a simple ping test between both partners.
Just think of, your PC where Plcsim is running is your real plc.