Your Clearstream account will automatically sync with CCB/Pushpay every 24 hours (around 4 am). This will ensure that your Clearstream lists stay up to date with any changes made in CCB.
If you need to re-sync with CCB in the middle of the day, go to Integrations > View under Church Community Builder > Run Sync Now. You can also sync a specific list at any time from the Subscribers page by clicking Sync Now underneath your list.