Private Internet Access generates a password for accessing the Virtual Private Network (VPN) that is different from the password used to access the main admin account.
Login to LastPass
Login using: Private Internet Access - Account
At the bottom of the web page look for the section: PPTP/L2TP/SOCKS Username and Password
Do not click the Regenerate Username and Password button or all the computers that use VPN will have to be re-setup
Copy the current Username and Password
Update LastPass: Private Internet Access - VPN Locations