To make changes your WhatsApp Business Profile, follow the steps below:
Go to WhatsApp Manager and select your business.
In the left pane, click Phone Numbers under "Account Tools"
Make sure the correct WhatsApp Business Account is selected on the top-right.
Then, click on the Phone Number for which you'd like to edit the profile. That will open the details of that number.
Click on the Profile tab.
From this screen, you can make changes to your WhatsApp Profile. You can change:
WhatsApp Profile Photo
Display Name
Business Category as shown on WhatsApp
Description
Address
Email
Website
Make the changes you'd like to make, then hit save at the bottom.
That's it!
If the changes you've made are in line with WhatsApp's formatting rules and Business Policy, it will get changed in 2-3 hours!
For accounts that are verified (have blue tick)
If you have an official WhatsApp Business Account (Blue Tick), Contact Facebook's Direct Support & provide the following details to change display name in your WhatsApp Business Account:
Question Topic: Request an Official Business Account
Request Type: Update OBA Display Name