Edge on top, white facing front
Step 1 / 4
U': Top face: turn 90°, front face goes right
The edge is at the top front, with white facing front.
White cross on the bottom. The edge goes to the bottom front, between the front and white centers. R' brings the edge down, F puts it in, R returns the right cross edge.
Step 1 of 4: U'. Top face: turn 90°, front face goes right