I have an I mac (late 2009) with the macOS Sierra version 10.12.6. First, I cannot find my iMac on our home network. Second, I have read and watched youtube vids and cannot figure out how to network my iMac to my laptop. It's frustrating the **** out of me. I have done the sharing option to share, but I am stuck at this point. Please help me with this issue. I am so freaking lost. Help, please. Thanks.