Uninstalling & Deleting
Before you complete the below steps to uninstall LastPass or delete your account, please contact us at Support to see whether we can help you address your issue: http://lastpass.com/support_helpcenter.php
If you find that you need to uninstall LastPass or delete your account, we ask that you leave us feedback in the forms provided so that we can either help you resolve the problems you're experiencing or use your comments to continue making improvements.
Uninstalling LastPass
Go to Start -> Program Files -> LastPass -> Uninstall LastPass.
If you only installed the Firefox extension (including on a Mac), go to Firefox -> Tools -> Add-ons -> LastPass -> Uninstall.
To uninstall the Google Chrome extension, go to Google Chrome -> Wrench -> Extensions and click the Uninstall link next to LastPass for Google Chrome.
To uninstall the Safari for Mac OS X extension, go to https://lastpass.com/dl to redownload the Safari install package, but select the "Uninstall" file when prompted.
To uninstall the Safari for Windows extension, go to Safari -> Edit -> Preferences -> Extensions -> LastPass -> Uninstall.
Deleting Your LastPass Account
Go to the Delete Your Account page and follow the directions. As the web page mentions, please be sure to export and save all of your data before deleting your account as this operation is not reversible. If you also can't remember your password you'll have to use Delete account no password which will have to first send you a confirmation email.
If you choose to permanently delete your account, you should also uninstall the software from every device you used with LastPass.