Hello sherryhagemeier,
Thanks for reaching out to us here. It's important your employee is added correctly so their tax is correct in QuickBooks. Rest assured, I'll be happy to guide you in the right direction so you can get back to doing what you love.
In order accomplish this you'll need to contact our support team using this link here. One of our specialized payroll agents will be happy to take a look at your T4 and help make the appropriate adjustments.
In the meantime, check out this helpful resource regarding T4s in QB Online: How to prepare T4 slips and summary. Feel free to keep me posted on how you make out. I'll be one message away in case you need anything else.