In the ‘map input’ buttons You could try sphere, or even cube, but you’ll mostly need to adjust map size x,y,z to get a natural look. also you may need to rotate 90 deg. That can be done in the bottom grid ( those 3 Xs, Ys, Zs…)
but if needed its easier in the ‘texture image’ pane where the image was selected.( rot 90)
Alternatly you may get good results with the ‘Cloud-vironoi’ texture. Just a thought.