This is basically the website:
Click to open link
But the problem is more than that!!
From the web down the SDK, and then open after first found no plugins window, OK, first through Help, Install New software ... Download the plugins development plugin.
The window is then opened plug-in development-A, plug-ins, other than Show View, window.
Find out why a plugin is NOT!!! This is not the same as the tutorial!!!
You'll have to pay attention from here.
First change the workspace to .../eclipse/plugins folder,
Then click File, Import, plug-in development, plug-ins and fragments,
In the popup window, import from changes to directory, and the path and workspace, import as to the third item "with Source Folders".
Next Find Jface.text, click "Add", finish.
After that you can change the Java file, and the same as the tutorial.
Note If there is no Java file .... That means your eclipse does not contain the source code, the next bar .... (If there is source code, plugins in that folder should also have Jface.text.source file)
Eclipse 4.4.2 Suppress SPACEBAR code on screen