This is just the basic how to turn on 2 Step Verification.

1. Go to your Google Account.
2. On the left navigation panel, click Security.
3. On the Signing into Google panel, click 2-Step Verification.
4. Click Get started.
5. Follow the steps on the screen.

Here is the link to the article for steps for enabling 2 Step Verification.

Click here for a PDF that walks you through it.