It's good to have new users join the Community. You're in good hands now, I'll be happy to help you with the taxes on your payroll.
After your first payroll run, QuickBooks will prompt you to setup your payroll taxes so that you’re ready to pay when they come due. I recommend you to proceed with making your first pay run so you can get the option to setup your taxes. Here's a helpful guide which will explain more about setting payroll using QB Online: https://www.intuit.com/content/dam/intuit/intuitcom/partners/documents/icom-education-program-ca-qbo....
In case you have other questions, feel free to contact our support team using this link here. One of our agents will be happy to take a closer look at your account and provide the support you need. Otherwise, feel free to leave a comment below.