I was told to put myself on as an admin but when I did that it took the owner off. How do I add me on as an admin but leave him as master admin?

Thanks for visiting the Community today, @chris230. I'm here to help set yourself as the company admin on the account. 

In QuickBooks, there's only one master admin per company. And by default, it's the person who set up your QuickBooks Online account.

To set yourself as a company admin, you'll need to sign in with the master admin account. Then, follow the steps below: 

1. Go to Settings ⚙ and select Manage Users.
2. Find the user (yourself), then select Edit in the Action column.
3. In the window that appears, choose Admin in the User type drop-down menu. Then, click Save. 

Once done, ask the user to sign out and then sign in to see the change. For more insights, read through this article: Add, delete, or change user access.

For future reference, read through this article to help you learn more about the different user types and user permissions in QuickBooks Online.

I'd be here if you need more help in managing your users in your QuickBooks company, @chris230. Take care.