You can change the color of text to one that coordinates with your presentation’s theme, or you can choose any color.
Select the text you want to change.
To change all of the text in a text box or a table cell, select the text box or triple-click the table cell.
In the Format 
 sidebar, click the Text tab, then click the Style button near the top of the sidebar.
In the Font section, do one of the following:
For colors that coordinate with your theme: Click the color well then choose a color.
For any color: Click the color wheel, then choose a color from one of the color palettes.
To change the text color used by a reviewer for markup, see Add and manage comments.
Tip: You can set a keyboard shortcut to quickly change text to a specific color.