Setup up SML REPL within Sublime Text | Programming Languages Part A

Packages - SML (Standard ML) and SublimeREPL Custom key binding - [ { "keys": ["ctrl+alt+r"], "command": "repl_open {\"cmd\": [\"sml\", \"$file\"], \"cwd\": \"$file_path\", \"encoding\": \"utf8\", \"external_id\": \"sml\", \"syntax\": \"Packages/SML (Standard ML)/sml.tmLanguage\", \"type\": \"subprocess\"}" } ] Obtaining same environment failed error - https://stackoverflow.com/a/34014231 Don't know how to install sublime packages or open up console & command prompt? Google is your friend. Fill in the gaps :)