Re: How to change your plataform
Sign in to the Battlefield website and in the top right corner it will show your username (this may be different on mobile devices). Hover over your username with your cursor and go down to "Settings". The first option on settings should have a drop-down box allowing you to change your profile to your selected platform. Press on your PS4 profile and the website should refresh and display your PS4 progress and emblems etc.
This link should also take you to the settings page on the Battlefield website: https://www.battlefield.com/companion/settings
- Danamo