1. Select the Gear icon at the top.
2. Select Account and Settings.
3. Select Billing & Subscription from the menu.
4. From the QuickBooks section, select Upgrade. If you don't see upgrade, this means you're already using QuickBooks Online Plus
5. You will be presented with options for upgrading, along with features and pricing. Select Upgrade for the product you want.
6. If prompted, enter payment information.
7. Confirm the upgrade and new billing rate, then select Confirm Upgrade.
Welcome to the Community, @kbatna2010. I'd be delighted to assist you with upgrading your QuickBooks Online version to Plus.
Here's how you can upgrade your subscription:
Click the Gear icon.
The following is a brief video to serve as an example:
I'm also including an article which covers this process: How do I upgrade my QuickBooks Online subscription?
Should you have any questions, I'm just a post away. Have a good weekend.