The cross on the bottom
On top, white facing up
The edge is on top, white facing up. Turn U to bring its color above the matching center (here green, at the front), then F2 brings it down.
Bottom
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Algorithm
U' F2
2 moves. The letters stand for the faces: review the notation.
Set up this case
From a solved cube, yellow on top and green in front, do this scramble: you get exactly this case.
F2 U
The cross on the bottom: other cases
Bring each white edge straight down to its spot, white on the bottom, no daisy.