It is no longer necessary to use Photoshop, just enter the flight details.
The flight ticked received from us is not a real ticket, although it looks like real. To generate a verifible flight ticket, you need a PNR number.
All responsibility for its use lies solely with you.
You want to visit another country, but have not yet decided when you will return. You might need the onward ticket on the assumption of countries entry requirements. Many countries insist a flight ticket be held out from their country, which must be presented upon arrival at immigration. Without an onward ticket, a traveler may be refused entry to these countries and subsequently placed on the next plane. Wikipedia