1. Open the WPS table and select the chart to edit.
2. Enter the chart editing mode. You can enter edit mode by double-clicking the chart or clicking the border around the chart.
3. In chart editing mode, you can see that there is a "Chart Style" button on the top toolbar, just click the button.
4. In the pop-up chart style dialog box, you will see various style options, including color options.
5, click on the "color" option, this will open a color selector.
6. In the color selector, you can choose a preset color scheme or a custom color.
7. To customize the color, you can click the customize option in the color selector, use the color palette or enter a color code to define a new color.
8. After selecting your favorite color, click OK to apply it.
9. Repeat the above steps, add and customize other 7 colors until the requirements of 8 colors are met.