• Copy plugin/DistractionFree.vim to ~/.vim/plugin

• Copy syntax/mkd.vim to ~/.vim/syntax

• Copy ftdetect/mkd.vim to ~/.vim/ftdetect

• Copy colors/iawriter.vim to ~/.vim/colors

• In .vimrc, specify the colorschemes and fonts to use in fullscreen mode and normal mode.

    g:fullscreen_colorscheme - colorscheme to use in fullscreen mode 
    g:fullscreen_font font to use in fullscreen mode 
    g:normal_colorscheme - colorscheme to use in normal mode 
    g:normal_font - font to use in normal mode
  

example (macvim):

	let g:fullscreen_colorscheme = "iawriter"
	let g:fullscreen_font = "Cousine:h14"
	let g:normal_colorscheme = "codeschool"
	let g:normal_font="Inconsolata:h14"

or, for gvim:

  let g:fullscreen_colorscheme = "iawriter"
  let g:fullscreen_font ="Cousine 12"
  let g:normal_colorscheme= g:colors_name
  let g:normal_font=&guifont

Under linux, you must manually activate fullscreen mode (ie ALT+F11)