The toolbar appears at the bottom of the screen. Select the columns you want to center the words across. Click on the Center Across Columns button. Increase Decimal adds a place after the decimal point. Decrease Decimal removes a place after the decimal point.
Borders adds or removes borders.
Color fills a cell or cells with the chosen color. Clicking on the down arrow opens a menu of colors from which to choose. Text Color changes font color. Clicking on the down arrow opens a menu of colors from which to choose.