Hi Sandy,
You can further customize the appearance of your text by adding HTML tags within the custom HTML field.
To change the color of your text, you'll add a font color tag and specify the color you want, either by name or by hex value. For example, to change text to red, you would add a font color tag and specify red as the color:
<font color="red">This text will be red.</font>
To further customize the size of your text you'll add a tag for font size, just like you did for font color. The available font sizes range from 1 to 7. For example:
<font size="4">This text will be size 4.</font>
If you want to change both the color and size at the same time, you'll add both tags around the text you want to modify. For example:
<font color="red"><font size="4">This text will be red and size 4.</font></font>
There's a lot of information on changing the appearance of your text in HTML online. A preliminary search for the exact attribute of your text that you would like to change should pull up a lot of basic examples.