How can I add another user or change user to email alerts for things like tax payment withdrawal?

I can help you how to add a user in your QuickBooks Online (QBO) account, @jsheedy.

You’ll want to send an email invitation to add a new user in your QBO account. I’d be glad to guide you how.

In your QBO account:

1. Go to the Gear icon.
2. Select Manage Users.
3. Click Add user.
4. Choose the type of user you want to create.
5. Enter the user’s name and email address and click Save.
6. Once done, let your user check their email and accept the invitation for them to be added to your company.

You can also check this link for more details in adding a user to your QBO account: Add, delete, or change user access.

Also, as of now, the option to be notified by email when someone made changes in your QBO account is not available. However, you can check the Audit log to see when and who made some changes in your company. 

Let me also add this article that can guide you through the process in case your user did not receive your email invitation: What to do if invited users did not receive your email invitation.

You can always get back to me whenever you have other questions in managing your users in QBO. I’m only a post away. Keep safe and take care!