Click the Star icon, select Adjust Tip.
You can search for a transaction by the transaction number, last 4 of the card, or tag value.
Once you find the transaction, add the tip amount on the receipt, and click the green arrow.
You can adjust multiple tips at once. If you want, find all the transactions, enter all the tips, then click the green arrow.
The Next screen will show all the transactions that have tips attached.
Click the green arrow again to finalize.
Once you click Yes, you will get a confirmation screen showing the tips have been successfully adjusted.