Add to Chrome.
Click 'Add extension' above.
The installation process should take less than a minute.
Next, you'll Create an Account.
I want to use Google Authenticator for my LastPass and Gmail accounts; what happens if I lose my phone?
Using Google Authenticator for your LastPass account and your Gmail account is possible, but if you lose your phone or mobile device, it could be tricky to get back into your account. If you choose to use Google Authenticator for LastPass and Gmail, you may want to set a LastPass security email (Account Settings > Security) that you can access without the use of LastPass or Google Authenticator. This ensures that you can have LastPass send you an e-mail to disable Google Authenticator should you lose your phone.