Turn off the power at the circuit breaker
Verify the power is off with a voltage tester
Identify the two-way switches and the light fixture
Connect the live supply wire to the common terminal of the first switch
Connect the common terminal of the second switch to the light fixture live wire
Connect the two traveler wires between the two switches
Connect the neutral wire directly to the light fixture neutral terminal
Connect the earth/ground wires to the grounding terminals and metal boxes if present
Tighten all terminal screws securely
Place the switches back into the wall boxes
Restore power at the breaker
Test the switches from both locations