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I'm here to guide you add yourself as one of the users in QuickBooks Online Point of Sale. Let me guide you with these steps:

1. Sign in to Merchant Service Center.
2. Go to Account, then select Users and check to see if you already have an account created for your user.
3. If not, select this invite link.
4. Enter your email address and then select a role. Users won't show on your list unless they accept your invitation.  

Afterward, you'll receive an invitation and click Sign in. Then, you'll get a link to the Merchant Service Center.

Also, if you want to manage user permission, you can check this reference: Add and manage users.

I'll be around whenever you have questions with managing user permissions.