Perhaps you need to alter an email address of an existing recipient on your Sharp Copier. The below is a small walk through on how to edit destinations.
Firstly log into the MFP's web page using the IP address in a web browser. You should be presented with the below screen.
Choose the Address Book and then Select the destination you would like to edit.
To edit the email address please look at the below screen shot and adjust the email address accordingly. Please note the Address 1 drop down menu, when you pull this down you will need to select Address 1, do not create a new email address as this will just add another destination to the user.