Add to Chrome.
Click 'Add extension' above.
The installation process takes less than minute.
Next, you'll Create an Account.
You might also find your answer in the LastPass Enterprise Manual.
How do I add user groups to a policy?
When you create the Policy from your Enterprise Admin Console, select Inclusive List of users (for whom the policy applies to), and under the G listing in the alphabetical list of users, you will see a list of all the user groups you have created. You can then add the group to the policy as you would an individual user.