Install the moin.vim script by copying the file to ~/.vim/syntax/moin.vim on Unix-based systems, or to $HOME/vimfiles/syntax/moin.vim on Windows systems. You may need to create the .vim (or vimfiles) directory, and you may need to create the syntax subdirectory. In Vim, your home directory is specified with ~ on Unix systems, and $HOME on Windows systems. You can see what directories to use by entering commands like the following in Vim: :echo expand('~') :echo expand('~/.vim/syntax/moin.vim') :echo $HOME :echo expand('$HOME/vimfiles/syntax/moin.vim')