Look over the images in your population. Which image is most appealing to you? Which images should be removed? Which images should be preserved?

Select the "best picture" button for your favourite image. The button should show a green background.

Deselect the "deletion" button for all images you will preserve. The button should show a white background.

You must take care that some pictures have the "delete picture" button marked.

Now click on the "sexual reproduction" button.