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When I see your image, it seems to me that you have managed to make a rough selection on the Shamrock image, selecting the petals and stem and deleting the black background. I must note that the selection is rough, but you indicated that this is good enough for your purpose.

At this stage, if you expect a transparent background, you should save the image as a PNG rather than as a JPG.

In the methods Sam explained above (layer mask or clipping mask), you are not required to remove the black background. It is sufficient if you are able to make a selection of the 4 petals and the stem. Please ask if I am unclear.