Download AddToAny 1.5.zip
Visit these site to download the file:http://www.tonystoolshed.com/wordpress/joomla/version-15/addtoany-button-for-joomla-15/
or in another place:
http://extensions.joomla.org/extensions/social-web/social-bookmarking/5432
Install the plugin on your joomla 1.5
Login to your joomla admin, then choose Extensions->Install/UninstallUpload Package File, and browse the location of AddToAny 1.5.zip location in your PC, clikc it and then Upload File and Install. If you succeeded, you'll get notification that the insatallation is done successfully.
Activate The Plugin
Go to Extensions-->plugin manager, you'll see a list of your insatalled plugins, choose content-AddToAny, in Plugin Edit area, Enable the plugin by choosing : Enabled Yes. You may also configure how to show the button, on front page, in article intro, on category page, on section page, even you may have section exclusion list, depending your choiches. The last, save your setting and preview how it performs in your site!