Registration Sticker Walkthrough
You will need to click the following link (DMV Website) and head over to the DMV or SOS website.
Once on the website you will need to click "online services". (See the image below. The arrow points to the link you will need to click.)
Next, click "email license plate renewal". (The arrow points to the correct link.)
Finally, you have reached the form you will need to fill out in order to obtain your registration through the mail. Your registration pin can be found on your expired registration if you no longer have your renewal card.
Fill out the necessary information on the log-in form, and follow the remaining directions on the SOS website.