Nothing happens when I click to Set Up Family Sharing.

Hello DiggerJoyce,

It sounds like you're experiencing some unexpected behavior when setting up Family Sharing on your Mac. Often, software updates include fixes for unexpected behavior. To begin, let's make sure your Mac is updated the latest version of macOS. Update macOS on Mac will walk you through backing up your Mac then updating.

"Before installing new software, it's a good idea to back up your Mac.

1. From the Apple menu  in the corner of your screen:
   1. Choose System Settings. Then click General in the sidebar, and Software Update on the right.
   2. Or choose System Preferences. Then click Software Update.
2. If Software Update finds new software, click the Update Now or Upgrade Now button to install it.
3. Enter your administrator password, if asked. During installation, your Mac might restart, and you might see a progress bar or blank screen several times.

If Software Update says that your Mac is up to date, then no new software is currently available for your Mac model. Software Update shows only updates and upgrades that are compatible with your Mac."

After updating (if applicable) try to Set up Family Sharing again.

We look forward to hearing the results.

Regards.