To change the fill color of an object in the current file, select the object and then click a color. To change the line color of the selected object, right-click a color. To change the color of text in a text object, double-click the text-object, select the text, and then click a color.
You can also drag a color from the Color bar and drop it on a draw object on your slide to change the fill color.
To detach the Color bar, click on a gray area of the toolbar and then drag. To reattach the Color bar, double click on an gray area of the color bar while pressing the CommandCtrl key.