Your Clearstream account will automatically sync with Breeze every 24 hours (around 4am). This will ensure that your Clearstream Lists stay up to date with any changes made in Breeze.
If you need to re-sync with Breeze in the middle of the day, go to Integrations > click View under Breeze > click Run Sync Now (far right). You can also sync a specific List at anytime from the Subscribers page. Click the 3-dot icon (far right) > Sync Now.