How to Apply patch

I would like to use the plugin In-Place-Editing in my app.But it
requires a patch to be applied as given in
"http://www.yjchen.url.tw/tips/in-place-editing-for-rails-20/" .I got
the patch file and the plugin.I would like to know how can i apply
patch???

The version at http://github.com/rails/in_place_editing/commits/master
already has that patch.

Fred