How can I add the full HTML format, and attach CKEditor to it?
Installation / Configuration


Unzip the module files to the "sites/all/modules" directory. It should now
      contain a "ckeditor" directory.
Download standalone CKEditor from http://ckeditor.com/download. Unzip the
      contents of the "ckeditor" directory from the installation package to the
      "sites/all/modules/ckeditor/ckeditor" (or "sites/all/libraries/ckeditor") directory.
      Note: you can skip uploading the "_samples" and "_source" folders.
Enable the module in the "Administration panel > Modules > User Interface" section.
Grant permissions for using CKEditor in the
      "Administration panel > People > Permissions" section.
      Note: In order to enable the file browser, refer to the
            "Installing CKFinder" section.
Adjust CKEditor profiles in the
      "Administration panel > Configuration > Content Authoring > CKEditor" section.
      Profiles determine which options are available to users based on the input format system.
For the Rich Text Editing to work you also need to configure your filters
      for the users that may access Rich Text Editing.
      Either grant those users Full HTML access or use the following tags:
      &lt;a&gt; &lt;p&gt; &lt;span&gt; &lt;div&gt; &lt;h1&gt; &lt;h2&gt; &lt;h3&gt; &lt;h4&gt; &lt;h5&gt; &lt;h6&gt; &lt;img&gt; &lt;map&gt; &lt;area&gt; &lt;hr&gt;
      &lt;br&gt; &lt;br /&gt; &lt;ul&gt; &lt;ol&gt; &lt;li&gt; &lt;dl&gt; &lt;dt&gt; &lt;dd&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt; &lt;em&gt; &lt;b&gt; &lt;u&gt; &lt;i&gt; &lt;strong&gt;
      &lt;del&gt; &lt;ins&gt; &lt;sub&gt; &lt;sup&gt; &lt;quote&gt; &lt;blockquote&gt; &lt;pre&gt; &lt;address&gt; &lt;code&gt;
      &lt;cite&gt; &lt;embed&gt; &lt;object&gt; &lt;param&gt; &lt;strike&gt; &lt;caption&gt; &lt;tbody&gt;
      To make copying the list easier, below all tags were placed in one line:
      &lt;a&gt; &lt;p&gt; &lt;span&gt; &lt;div&gt; &lt;h1&gt; &lt;h2&gt; &lt;h3&gt; &lt;h4&gt; &lt;h5&gt; &lt;h6&gt; &lt;img&gt; &lt;map&gt; &lt;area&gt; &lt;hr&gt; &lt;br&gt; &lt;br /&gt; &lt;ul&gt; &lt;ol&gt; &lt;li&gt; &lt;dl&gt; &lt;dt&gt; &lt;dd&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt; &lt;em&gt; &lt;b&gt; &lt;u&gt; &lt;i&gt; &lt;strong&gt; &lt;del&gt; &lt;ins&gt; &lt;sub&gt; &lt;sup&gt; &lt;quote&gt; &lt;blockquote&gt; &lt;pre&gt; &lt;address&gt; &lt;code&gt; &lt;cite&gt; &lt;embed&gt; &lt;object&gt; &lt;param&gt; &lt;strike&gt; &lt;caption&gt; &lt;tbody&gt;
      If you are going to use CKEditor with the Filtered HTML input format,
      please refer to the "HTML Filters and Inline Styling" section.
To have better control over line breaks, you may disable the line break converter
      for a given text format in the "Administration panel > Configuration > Content authoring > Text formats" section (recommended).
Modify the ckeditor.config.js file to adjust it to your needs (optional).
      Configuration options are described here:
      http://docs.cksource.com/ckeditor_api/symbols/CKEDITOR.config.html
      Developer's documentation for CKEditor:
      http://docs.cksource.com/CKEditor_3.x/Developers_Guide
      WARNING: Remember to clear the browser cache after you have modified any of the JavaScript files. If you skip this step, you may notice that the browser is ignoring your changes.