How do people make book covers for the Image Manager thing?

u don't need cover-making software specifically, but if u want to make a cover yourself, an image-editing program will work. GIMP is a free image editor and can be used for making covers (link). I have the program myself on Windows (even though I'm not much of an artist), but the link I gave u is to their Mac version.

I'm pretty sure Macs have Paint... I used one myself...

Anyway, u can use any picture of create your own. Programs u can use to make your own digitally are Photoshop, GIMP, Paint Tool SAI, and more. GIMP is the only free one here though. of u can just traditionally make your own cover door drawing.

I use Photoshop Elements 10 and a free computer app called Seashore, and occasionally I use the smartphone apps PicLab, Instacollage, and Camera+. Hope this helped, love!