If you need to transfer terminals to catch another flight, there is a clearly signposted walkway from the luggage retrieval hall to Terminal 1. Members of staff at Dublin Airport can point you in the right direction if required.
Walking from terminal 1 to Terminal 2 and vice-versa at Dublin Airport can be confusing due to where you enter and exit the walkway between both terminals.
In you are arriving at Terminal 1 and walking to Terminal 2, upon exiting security take the escalator or lift up to the departures level. The entrance is located opposite Check-in area 1. If you are landing at terminal 2, turn left in arrivals and follow the signs for Terminal 1. You will arrive at the departures level at Terminal 1.