Ckeditor and ckfinder

drush dl ckeditor

drush en -y ckeditor

drush ckeditor-download

drush cc all

drush dl imce

drush en imce

drush cc all

configuration - ckeditor - edit full HTML - file browser settings - set all 3 to imce

-- Old way --

Install the drupal module:

https://drupal.org/project/ckeditor

You will need to download and install the editor:

http://ckeditor.com/download

and the ckfinder

http://cksource.com/ckfinder/download

The installation instructions are:

https://drupal.org/node/728210

This will only work in the Full HTML edit