To change your email address on the metro PCS huawei phone, you need first to open the "Messaging" icon on your Metro PCS, go to the "Menu" options and select "Email". Then, choose the "Setup Accounts" option from the email "Menu." Select "Other mail" from the email provider list and enter a "nickname" for your Yahoo email account. Select "IMAP" for the Mail Server type and enter your yahoo email address as the "Username". Visit http://www.ehow.com/how_5808490_set-email-metro-pcs-phone.html for more information.