Follow the SMB instructions HERE
No username and password required unless you enabled them in the CoreELEC addon settings.
If you open finder you should see CoreELEC in the sidebar of your mac as a shared device,
Click on it and and all the CoreELEC folders will appear.
Copy and Paste the remote.conf into the root of the .Config Folder.
Type Terminal using Spotlight.
Terminal App is used to SSH for your reference.
You have to enable SSH in CoreELEC Settings addon