Can't attach photos to email because password is not accepted?

smtp.mac.com. followed by my telephone number@talktalk.net comes up on form and have inserted my user password or my yahoo password but neither is accepted.Am trying to find a talktalk password.

Can't attach photos to email because password is not accepted?
looks like you need a new one


go to the 'forgot your password?' link
Reply:click on forget your password and follow options