Samsung Galaxy S3 — CM Security Avatar

You need to first sign into your account, on the bottom of the screen there are three icons home, settings, me, click on me and there very first thing you should see is your email and a blank avatar. Click on the avatar and choose the picture you want to use. I have found in these past sometimes this won't work when your on a wifi connection it'll keep coming up with connection error 1, I just use my data connection to sign in and then change the settings you need to change.
I hope this helps, good luck, if you have more questions just ask I'll try to help you out the best I can.