To update a synced registry from the mobile app: 


  1. Click the Dashboard icon to the left of the Gift List on the bottom panel
  2. Select Synced Registries
  3. Tap the store logo you wish to remove 
  4. Select Update and Re-Sync


You can also find this option by selecting the Menu button (3 horizontal lines) on the bottom right-hand side. Click the Things to Do tab and select Sync store registries.