Hello Ted,
Regarding the software LastPass you can follow documentation (surprise surprise) on LastPass' website:
https://helpdesk.lastpass.com/multifact ... cation/#h4Test it first from your PC and then from your mobile phone. You can always revert it from your PC.
Regarding U2F for Gmail, Google does not support NFC directly from their "Google Authenticator" application. As described in their documentation:
https://security.googleblog.com/2014/10 ... -with.html it is providing strong authentication via USB.
There are few workaround to this:
for example on Android you could use the Yubico Authenticator which basically does the same thing as the Google Authenticator.
The secrets are stored in the secure element of the YubiKey, retrieved via NFC and displayed on your mobile device screen.
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https://play.google.com/store/apps/deta ... oath&hl=enIn any case before doing anything it is recommended that you learn about OTP technology by reading documentation available at:
https://developers.yubico.com regarding OTP technology and U2F.
And Google's TOTP:
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https://en.wikipedia.org/wiki/Time-base ... _Algorithm-
https://support.google.com/accounts/answer/185839?hl=en