How do i turn this image into a skybox?

I’ve done this in terragen 2, how do i make it into a skybox now?

I didn’t know what size to put it in, also i know it clips, but this is just a test atm. should have tutorial on that.

doesn’t say that much :confused:

Really? Well I would then go about searching google. for a more useful tutorial, or paste the textures in the skybox and pray for it to turn out.