Allow incoming SCP connections on Mac

System Preferences pane → Sharing applet → check the Remote Login checkbox. This will enable SSH, and in turn, SCP.

In the settings there is the option to activate SSH. I think it’s under Sharing → Remote Login.

You might have to open a port. My router's address is 192.168.0.1, it's default name is admin and password is, I think, password. Yours might be the same. Check the bottom of your router. Default port is 22.