How can I customize my avatar?

Profile picture is the profile icon found in the various parts of the OS, such as homescreen (function area), quick menu, log-in screen, etc.
This guide will show you how you can easily make any picture as the profile avatar and how to change your account name.
Note that you need a activated account first!

Changing avatar picture

Download and install:
After installing everything, including DirectX 9.0, prepare your image (format doesn't matter).
Make sure your image is a perfect square format, to ensure no part of the image will be cropped or stretched (use any type of image editor if needed).
Open PS4 Avatar Maker, select the type of account (Local or Activated).
Double click the middle part and select your image.
Select Export Avatar, and select a name and location.
Put the exported avatar on a USB Drive or FTP to a location on the internal HDD of the PS4.
On the PS4, jailbreak using GoldHEN.
Open PS4Xplorer, navigate the location of the avatar you set.
Select it and press X to apply (you might need to do it 2 times).
To see it, log out and log back in your account (you don't need to reboot).
Done.

Jailbreak your PS4 with GoldHEN.
Navigate to PS4 > GoldHEN > Enable FTP server. Take note of PS4's IP Address.
On PC, open FileZilla or your desired FTP client and input the PS4's IP as host and port 2121.
Navigate to /system_data/priv/cache/profile/0xNUMBERSYOUHAVE.
Edit online.json on Notepad++ or any text editor. If you don't have a online.json, download a copy here
Replace "myFirstName" with your desired name.
Replace "myLastName" with your desired name. If you don't want a last name, leave the section as "".
Save changes and replace online.json with old one.
Done.