You have to use the Manual Form Edit feature to handle such sites.
1) Navigate to the main Sticky Password window - Web Accounts
2) select the account that you would like to edit
3) press More - Edit - Options tab
4) select Define settings manually to open the Manual Form Edit and load the website of the Account
(NOTE: it may take a few moments for the website to load, please be patient)
The Edit form will open in a new Sticky Password window. Your web-page will be displayed in the bottom half of the window. The top half of the window shows the active fields on the web-page that require data entry. Here you will be able to select the behavior of the fields. Fields for which Sticky Password will populate data are shown with a 'check' mark.
By 'checking' or 'un-checking' one of the fields, you are able to manually change the 'value' that you would like Sticky Password to populate each time the web-page is accessed.