How to Add HTML Code Into an Article
 In order to add HTML code into an article, make sure that the text filters are set correctly or else Joomla will remove the code when you save. See the article: Joomla 2.5 is stripping out HTML code from articles.

Using TinyMCE

1. Click on the HTML button in the menu. The HTML source window will popup in another window.
   
   Note: You must enter the HTML code in HTML mode or else Joomla will treat it as normal text and display the HTML code as text.
2. Paste the HTML code into the HTML Source Editor.
   
3. Once you have entered your HTML code into the source window click Update.
    

Using JCE

1. Either click on [Toggle Editor], as indicated by the blue arrow,  above the text editor field or select Toggle Source Code, as indicated by the red arrow, and then paste the HTML code.
   
2. Paste the HTML code into the HTML Source Editor.