How to modify C++ files for a plugin?

The plugin files are located in the engine plugin folder. Here’s what I’ve tried:

  1. Editing the files and building the engine
  2. Editing the files and selecting Windows->Developer Tools->Modules->Recompile the plugin

After doing either of these, none of my changes show up in the editor.

Is there anything else I should do besides moving the plugin files to the project folder? I was planning to follow this process: wiki.unrealengine.com