To change your business logo on your WhatsApp Business account, follow the below steps:
1. Go to Meta Business Manager and select your business.
2. Click on "All tools" icon in the left side menu.
3. Click "WhatsApp Manager".
4. Choose the account you want to change the logo for.
5. Navigate to the left side menu and click "Phone numbers".
6. Click on Settings icon next to the phone number.
7. Click on Profile from the left.
8. Click on Choose file and select the photo.
9. Click on Save button on top right corner.