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You will need to locate a number that identifies the shade of the blue used in the background. This number is called the Index number.

In PSP Version 3, the Index number is located along the bottom of the window.

PSP Version 4 has the same set of numbers, but it is located directly above the foreground color indicator.
It helps to understand where this magic number comes from.

We are using a 16 color palette for our image. Each color in the palette is numbered from 0 to 15, so each color can be identified using a number. The light blue color is located at position #14, so it is index number 14.

Sounds reasonable to us...