My screenshot 4 3D screens with cube, cone and sphere sitting on each other. Where to attach the jpg ? 
I believe you have to make a post before you can get the permission to upload JPG’s (there’s a little upload button). You’ll probably be able to edit your post and add it now, or post a reply to this. Probably, lol. There’s also a big thread around here where people are uploading their basic shape creations and you could try that.
Thanks McFuzz