Open Snapchat
Go to the camera screen
Tap the smiley face icon next to the capture button
Browse and select a filter or lens
Tap and hold the filter if available
Tap the favorite or bookmark option if shown
Use the filter again from your saved or favorites section
Save the snap to Memories if you want to keep the result
Check your saved lenses in the Lens Explorer or Favorites area
Update Snapchat if the save option is not appearing