These are the instructions from the Lodestone.

Players can now carry over configuration settings including hotbar and macro settings from the PlayStation®3 version. After starting the launcher, select "Transfer Character Data," then follow the on-screen instructions to complete the process.

1. After starting the launcher on PlayStation®3, select "Transfer Character Data" and upload the character data.
2. Once the upload is completed, switch over to PlayStation®4 and log in with the Square Enix account that you use to play the PlayStation®3 version. Then select "Transfer Character Data" placed at bottom right side of the launcher and download the charcater data.