I have already taken the QBO exam and now want to do the advance

Hello Karen, 

Congratulations on completing your QuickBooks Online exam! 

To take the Advanced course, simply log into your QuickBooks Online Accountant account and click the ProAdvisor tab on the left navigation menu. Select the Training tab at the top of the page, and click "Get Started" next to the Advanced Certification course. 

Here's some additional resources about the ProAdvisor program in QuickBooks Online:

• QuickBooks ProAdvisor Benefits, Tiers, and Points
• Redesigned ProAdvisor's Program FAQs
• Confirm your ProAdvisor Profile
• ProAdvisor Support

I hope this helps. Let me know if you have any other questions. 

Have a great day!