Are you going to get back to me?

I'm not too savvy with computers, where is the Screen Options area, are there pics, or is there a tutorial about it? As you can see in the pic, they are alphabetical, I don't want it to be. Also I can't seem to upload the picture

On my Home page and on the Catalogue page it sorts alphabetically. How do I change it? It would be great if it would just vary every time automatically, but I would be happy if I could just change it manually.

How do I change the sorting of listings on my Home page?