-Sky-

..and 4 states of the day:

1) dawn
2) day
3) dusk
4) night

Let's say we want to make a special sky, where it's all red during sunrise, orange throughout the day, purple during sunset, and all black at night.

We start with the dawn's colours:
For the top part of the sky,

For the bottom part of the sky,
1) Click "Dawn (Top)"
2) Slide the colours to get what you want

For the sun's colour,
1) Click "Sunrise"
2) Look for the sun so you can see what you're changing
3) Slide the colours to get what you want

For the ambient lighting,
1) Click "Dawn Light"
2) Look for something on the map that is affected by lighting. The ground is a good example.
3) Slide the colours to get what you want

For the clouds' colour,
1) Click "Dawn Clouds"
2) Look for the clouds
3) Slide the colours to get what you want

And we're done with the dawn's colours! It is all pretty and red!
The rest are exactly the same steps, so here's a summary for Day, Dusk and Night.

Orange day!
Purple dusk!
Black night!

And we're finished! Now just to save and test your sky:
1) Under "File Name" enter your sky's name. Try not to use weird symbols.
2) Click Save.
3) After saving, your sky's name should appear under the list of skies you can load from.
4) Test your sky! You can watch how the sky changes colours throughout the day and night.

Finally, using your sky in your map is as easy as entering the sky's name in Map Maker:

Now go paint your own sky! :D