Hello there, @Ngoh.

Let me share some insights about managing user roles.

The Role tab is exclusively available in QuickBooks Advance. If you're wondering how to add and manage users in QBO Advanced, here's a simple guide to follow: 

1. Click the Gear icon.
2. Hit the Manage Users.
3. Select the Roles tab.

If you need more detailed information on how to add and manage users, you can refer to this article: Add and manage users in QuickBooks Online.

For future assistance, if a user does not receive an email invitation after it has been sent, please refer to this article: What to do if invited users did not receive your email invitation in QuickBooks Online.

If you have any questions about adding or managing users, please feel free to reply below. We are always here to help!