you can have a few problems that you may be seen as:+ your Google apps does not work properly.
+ you have moved you host and your Google apps email does not work?
+ your email only can send the email but can not receive the email.
+ you don't know how to add more users/emails to your Google account.
+ you don't know how to set up google apps email to other Email Programs.. ect.
Please note that 5$ is only for 1 domain in your Google apps email. if you have more than 1 email need to be fixed, please add the extra.
i can help you to resolve these problems, just contact me.
P/S if you need more users/email for your domain, i can set up all for you in my google apps account just cost 5$/email/year (google costs 50$). please see my other gigs for more detail.