Reconciling means clearing or "posting" transactions.
Transaction Types
Income
Inflow
Expenses
Buys/Sells
Transfers
Payments
How To Reconcile
Ensure you're in the "Not Reconciled" view of the transactions database on any page that has access to it.
Tap on the checkmark on the left-hand side:
Once a transaction is reconciled, you can move it back to pending by going to any of the other transaction views and tapping on the blue checkmark.