hello marilynmars, the next time when you enter the right credentials on that site, firefox should ask you if you want to overwrite the existing one.

Password manager - Remember, delete and change saved passwords in Firefox

Use these steps to remove saved (form) data from a drop down list:

1. Click the (empty) input field on the web page to open the drop down list
2. Highlight an entry in the drop down list
3. Press the Delete key (on Mac: Shift+Delete) to remove it.

• http://kb.mozillazine.org/Deleting_autocomplete_entries

Thank you so much! Your solution solved the problem!

Thank you for your response. The following actually solved my problem:

Use these steps to remove saved (form) data from a drop down list:

   Click the (empty) input field on the web page to open the drop down list
   Highlight an entry in the drop down list
   Press the Delete key (on Mac: Shift+Delete) to remove it.

I am following the above directions,but when I relog into the same website the user name still pops up.

(I have already removed the password from the password manager)

What am I doing wrong?

The user name may be stored as form data.

• Tools > Options > Privacy > History: "Remember search and form history"
• https://support.mozilla.org/kb/Form+autocomplete

You may need to clear cookies from that domain in case the website is remembering you.

"Remove Cookies" from sites causing problems:

• Tools > Options > Privacy > Cookies: "Show Cookies"