Yes, they can, srobel7. 

In QuickBooks Online, they have the right to modify, issue a check, and print depending on the access you've given to them to perform a task. Please see the different options for user and access permissions to learn more details.

Also, you can check the Audit log to see whose users made changes to your account. Here's how: 

1. Go to the Gear icon in the upper right corner.
2. Select the Audit log.

I have here the articles that will help you in managing your users in QBO:

• Add and manage users in QuickBooks Online.
• Managing accountant users in QuickBooks Online.

If I can be of any additional assistance with managing your account, please add them below. I'll be glad to help.