To geodrop, tap the assets bar, then tap "Geodrops", then "Add Geodrop." A config screen should then appear. On this screen you can select the amount you would like to drop from your total. You can drop it on the current tile you are in or any tile. Any tile means the next geomined tile anywhere. You can also restrict it to an email. This allows you to send your collected balance to another user. Finally, you can add a short note with the geodrop that will only be seen by the user that opens it.