WordPress.org

1. Unpack the download-package
2. Upload all files to the /wp-content/plugins/ directory, with folder
3. Activate the plugin through the 'Plugins' menu in WordPress
4. Edit content or template of your theme

Code:

<a href="javascript:fname('style','id');" >fontstyle</a>

<a href="javascript:fsize('size','unit','id');" >fontsize</a>

Example:

<a href="javascript:fname('serif','content');" >fontstyle serif on ID content</a>

<a href="javascript:fsize('1.2','em','content');" >fontsize 1.2em on ID content</a>

See on the official website.