How to set the default site name?

Dear Sir,

When an user is created or an order is created, an email is sent. However, it is using my old domain name ( www.vivatec.hk ), it would not use our new one www.petitemonde.com.hk , may I know how to set it?


Email Example:
Hello administrator,

A new user 'may cheung', username 'ripple_1008', has registered at www.vivatec.hk/ .

Hi,

I think that one of the solutions will be to directly edit your language file through "Hikasho->System->Configuration->Language->'YourLanguageFile'", and change this line :

HIKA_USER_ACCOUNT_ADMIN_NOTIFICATION_BODY="Hello administrator, <br/><br/>A new user '%s', username '%s', has registered at %s."

HIKA_USER_ACCOUNT_ADMIN_NOTIFICATION_BODY="Hello administrator, <br/><br/>A new user '%s', username '%s', has registered at www.petitemonde.com.hk."