Edit your section list at the bottom of the Settings > Product page in the Edit Sections box.

Here you can edit the name of the sections, the order in which they appear on the New Order page, the background color of the buttons and the color of the text.

For the order in which they appear the lowest number has the highest priority. So sections with 0 will appear at the top of the New Order page, followed by 1,2,3...

For setting the colors of the buttons and the text you can click in the color box and select the color in the tool that appears.

If you prefer to set an exact color you can enter the 6 digit color code. Examples are FFFFFF for white, 000000 for black, FF0000 for red, 0066FF for blue.

Once finished press the blue Update button below.