Use the “Safari” pull down menu and choose “Preferences”.
Choose the “AutoFill” tab.
Uncheck the “User names and passwords” check box.
Click the “Edit…” button to the right of the “Other forms” check box.
Scroll down and find the “.spedforms.org” line.
Click on “.spedforms.org”.
Click the “Remove” button.
Click the “Done” button.
Close the Preferences dialog.