How do I prevent LastPass from filling erroneous form fields?
As an example, let's say you are on https://www.google.com/ and there is a field on that page that LastPass is filling with the value 'abc123'.
To prevent LastPass from filling in the value, follow these steps:
1) Locate the site in your LastPass vault that contains the data 'abc123'. The easiest way to do this is to go to your LastPass vault and search for 'google.com' to list all matching sites.
2) For each matching site, click the Wrench icon to bring up the Edit Site window. If you saved the site originally using the Save All Entered Data method, then the fields will be displayed. If we automatically saved the site for you, click on the Wrench icon at the bottom of the window to edit the saved form fields.
3) Look for the field with a value of 'abc123' and click [-] to delete the field.
4) Click 'Save' to dismiss the Edit Form Fields dialog.