iMessage keeps popping up

How can I disable the iMessage pop up when I turn on my Mac? It keeps asking me to sign in with my Apple ID. I don't want to set it up because I don't want to use iMessage. But the box keeps opening every time I turn on my Mac and it is getting frustrating as I have to go through 3 pages before I can turn it off.

Solution 1:

I had to contact apple support for this solution. The fact that it is not intuitive implies a usability bug. The reason for the prompt is a keychain entry under either login or local items. Basically after removing all entries with the text 'apple' in them I was able to restart and login with no facetime or imessage prompts to login. I hope this helps.

Solution 2:

iMessenger is the iOS version for iPhone/iPad etc. On your Mac, it's called "Messages". Open Messages, go to your Preferences tab in Messages. Select your Message account from the list on the left, then click on the checkbox next to Enable this account to remove the checkmark and disable your Message account on your Mac.