While the Colors tab is displayed, move your cursor outside of it. The cursor now looks like a pointing hand.
Alternatively, you can click a color first and then, holding down the left mouse button, drag the cursor off the Colors tab. In this case, the cursor becomes a paint brush.
When you release the mouse button on text with an appropriate attribute, the text--and any additional text that shares this attribute--are set to the specified color.
Click Defaults if you want to reset all colors to their default values. Click Save on the File menu to retain the new color settings after you exit the Design Tool.