You have to purchase a playstation 4. After you do that, you have to go purchase a Copy of Grand Theft Auto 5 for the playstation 4 system.
After all of that is done, you have to purchase a subscription to playstation plus. This will enable you to play games online. Once that is completed, you will need to play grand theft auto 5 and start an online character.
Once the online character is completed, you will have to press "Start" then go to "Gallery" and upload your mugshot to your social club account (forgot to add that youll have to make a social club account)
Once it is uploaded you will have to go to a computer or tablet and log in to your social club account at socialclub.rockstargames.com
From there, you will need to go to the "Snapmatic" tab. Then you should see your characters mugshot. Right click it. Click "Save image as" and save it to your desktop.
After that, you will need to log into your IC account and click your profile. Click your picture to change your avatar. Click browse. Go to desktop and you will find that image you saved. Double click it and it should load.