Thank you for reaching out to the Community. Let me share some information about contacting QuickBooks support.
I know that you need to get hold of someone for your urgent concern. However, the Community is a public forum, and the ability to call is unavailable.
I'd suggest using the Start a chat feature from the Help menu. Our Support Team has access and tools unavailable to me so that your information is kept secure and private.
Our Customer Support Team is available from 9:30 AM - 6:00 PM PT (Monday - Friday).
Additionally, can you share with us more information about the help you need? You can add more details by leaving your response below.
For additional reference, I've attached a link you can use to learn more about using QuickBooks Online: Get started with QuickBooks Online.
Please know that I'm just a post away if you have any other questions or concerns related to the product. Take care.