Rotating the picture

Good day!

We have many Orb Minis and for now, they are sitting on the floor. We want to mount them on the wall with the kits they came with. But when it is on the side, the picture is sideways also. I think there is a way to rotate the picture 90 degrees, but for the life of me, can’t figure it out.

Anyone know how to do it?

Thanks!