How do I delete my number from iMessage on send and receive from my iMac? When I go to settings, iMessage does not show up under anything and I cannot access iMessage settings straight from the iMessage icon. Please help! There was a previous answer that said you could press command and comma, but when I press this, I get this picture.


Please help! Thank you!
First make sure that iMessage is the active application, i.e. the word iMessage shows on the top left in your menu bar.
Then press cmd+, to access the preferences.

This works for most apps, in your question you demonstrate this for Firefox.