If I understand you, you couldn't remember your old user name or anything about the account, so you created a new account using the new member name "Terriann". Now you would like to use your old email address on the new account, but can't. Is that right?
You can change the email address on your account, but from what you say, it seems like you can't change it so you and another member are using the same email address. So the thing to do would be to change your email address to something else (so your messages don't go to your husband's email account, and so if he ever wants to join, he's not blocked the way you were.) If you don't already have a second address to use, you can open a new free email account with Yahoo or another service. And, btw, if you want to, you can have any email that goes to the new email address forwarded to the address you're now using as your main email address (but to do that, you have to use the mail forwarding feature on Yahoo or whatever service you use.)
To change your email address, click on the "User control panel" on the top left of this page. Then click on the "Profile" tab. Then select "Edit account settings." You can change the email address there.
BTW, one way to find your old account would be to remember something you posted, then search for it using the "search" function. But that may be impossible, or too much work.