I want to use
amstex in my MiKTeX on my Mac. I cannot find any instructions on how to install any package. Are there instructions? If not, how is it done.
I am using MiKTeX on Windows, I do not know MiKTeX on MAC.
With the current MiKTeX Console you can find out which packages are installed on your system and if there are packages available, but not installed on your system.
Start the MiKTeX Console and click on "Packages" (left red circle in screenshot). Then you get a list of packages. Now click on "Installed on" (right red circle) to sort packages list. After that you can see not installed packages (No entry in column "Installed on", see red marking a) and installed packages (see red marking b).
To find in the list of available and installed packages special packag(s) like your searched
amstex you can type the name in the writing field, in the next screenshot marked with a red circle. Then click on the symbol right (see red arrow). After that you get a reduced list of packages showed, containing the searched letters. In the shown screenshot below you can see that that package is already installed on my system.
If you need to install it click on the name in the list (the line gets blue) and click on the + sign (red circle; in my case not activated, because the current package is already installed) to get marked package installed.
I do not think that MiKTeX Console will react very different on MAC. I can you only show the windows version ...