1. Installer
Under windows you can download a small installer that will update picasa for you: Installer.
2. Manual installation
With the latest version of picasa you can copy the Button file into the buttons directory of picasa (typically C:\Program Files\Picasa2\buttons on Windows) For older versions, such as on Linux, you have to modify the file runtime/btnconfig.xml and append the following lines:
<button id="custombutton/picasa2flickr" type="dynamic">
<icon name="outputlayout/poster_icon" src="runtime"/>
<label>Send To Flickr!</label>
<tooltip>Upload your photos to flickr</tooltip>
<action verb="hybrid">
<param name="url" value="http://picasa2flickr.4now.net/"/>
</action>
</button>
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