<p>Your Text <a href="mailto:firstname.lastname@example.org">Email Link</a></p>
The Your Text there will be text that doesn’t link to an email address. The email@example.com is the email address you’d like to link to. The Email Link is the text that would appear on the front end of your site that will be the email link. Change those to fit your needs.
Save your changes.
Here is how to center the text, change the font size and colors:
Go to your theme options page and choose the Advanced tab.
The top style there will actually center the text. The font-size: 20px sets the size of the text in the footer. The #footer a color is the color of any links you add. The #footer p is the color of any text that’s not a link.