1. Download this
2. Attach the file to an email and send it to the email account you have linked with your device.
3. Once you get it, it should look something like this:
4. Click on it, and it should look like this now:
5. You should get a message like this: (just tap install now)
6. It will ask you to pick a password, pick yours:
7. When you go to unlock your home screen it should look like this: