You can find below all the appropriate instructions on how to install the CKEditor - WYSIWYG HTML editor on Drupal 7.
1. Download, extract, and place Wysiwyg module http://drupal.org/project/wysiwyg in the modules folder /sites/all/modules/ like any other Drupal non-core module.
2.Download for the latest CKEditor http://ckeditor.com/download (At this time CKEditor 3.6.6 http://ckeditor.com/release/CKEditor-3.6.6 is recommended because the latest CkEditor 4.x could not be detected from WYSIWYG API wysiwyg 7.x-2.2).
3. Extract the editor package inside /sites/all/libraries/ folder (create this folder if it doesn't exist). Make sure that the resulting structure is as follows: /sites/all/libraries/ckeditor/plugins/
4. Enable the Wysiwyg module through the Modules page.
5. Configure the Wysiwyg profiles through Home » Administration » Configuration » Content authoring » Wysiwyg profiles
6. Set the CKEditor for the Full HTML input format and Save this setting
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7. Edit the Full HTML format
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8. Configure the CKEditor buttons and Save your settings
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9. Finally, you should see the CKEditor for the Full HTML input format by editing your node
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