A nice one is Lucida Calligraphy, bold, size 18, underlined. If you don t like it, undo it right now. Also click the Floating option. Antialias will get you finer detail. Type the text you want.
Text shows up on button, with moving scrolling.
Click on the Move tool, the crossed arrows. Click and drag the text to center it on the button. Click on the foreground color box. Up comes boxes and a shaded area to right. Choose one of the standard colors.