How Do I Clear My E-mail Password?

Mary from Phoenix, AZ writes: Help, when my husband was signing into our email account, he accidentally put the password along with the email address. So when I go and sign in a box comes up with the email address and password, how do I delete this, or do we need to make up another new password? To delete it once, you simply need to highlight the text, hit delete and then enter the correct information. But to keep the wrong password from popping up every time, you need to stop your browser from remembering the incorrect information.