Gregarious is the ultimate social bookmarking plugin. Everything is configurable. Share link, Digg button, stats, FeedFlare, LiveSearch and more.
Firstly, make sure that the
<?php wp_footer(); ?> call is included in your template, usually in footer.php. Without this, the popup wont work. This will fix 99% of issues.
If you're still not getting the popup, make sure you've turned on the relevant setting in the options page, and try saving and / or resetting the options.
Gregarious gives you the option of either using template tags or the PostBadge module to show links / badges on your posts. The easiest way to show links on your posts automatically is to activate and configure the PostBadge module.
When all else fails, we're still here to help. Contact the developer for assistance by posting a comment at the official website.