Install BuddyPress Birthdays, then go to Appearance > Widgets and add the Upcoming Birthdays widget to any sidebar or widget-ready area on your site. That’s the whole setup, no separate settings page beyond the widget’s own options.
What You Can Configure
From the widget itself: how many members to show at once, and whether to display each member’s age alongside their birthday. The age toggle matters for sites where members might not want that public, it’s off by default in most configurations, on by request.
You can add the widget more than once, in different sidebar areas, with different settings each time, a compact version in a small sidebar, a fuller one on a dedicated community page.
What It Actually Does
Displays members with birthdays coming up, pulled from whatever birthday field your BuddyPress profile setup already collects. Members can see the list and send wishes directly, which is a small but real engagement nudge, it turns a date nobody would otherwise notice into something visible on the site.
Pricing
Free (v2.4.1, updated within the last few months, tested with current BuddyPress and BuddyBoss). Download it here; setup documentation is at docs.wbcomdesigns.com if the widget options need more detail than the defaults.