
Michael H. answered 07/11/19
3D Animation Professor Game Design, Digital Media, Motion Graphics
Assuming you have iChat within the OS you can simply open application (you may have to search for it in Finder). When the app is open it will be populated with your Contacts associated with any ICloud account with your credentials. You can then search through the contacts to start a chat or you can add additional members to the contacts. I hope this helps?