Log into google apps account and click on Verify Domain
Choose the method of "Add a <meta> tag"
Copy the content section
Example: <meta name="google-site-verification" content="Qeyb93YVnAPfJYegrtyeywsSrGXl0zyedfsgdg" />
you would copy the following; Qeyb93YVnAPfJYegrtyeywsSrGXl0zyedfsgdg
Go to your MiStable Website Admin and click on Config and then the Meta/link Tags Tab
Click Add Tag
In the Content Section paste the content you previous copied
In Meta Name, copt and past the following; google-site-verification
you can leave Property Blank and then click Create to save
Go back to Google apps and click verify.