Thank you very much for the reply.
I had already setup an email text but now we have changed our telephone number.So want to edit that telephone number.
When i go to System-Transactional email ,It shows me New account and HTML code which does not match with the current text that goes in email to customer.
When i check in System--Configuration--Sales--Sales Email-everywhere it shows Default templete from Locale.
Is there any php file on server where i have to edit it?