In QuickBooks Online (QBO), accounts marked as active are expected to appear in the journal entry dropdown list, mshehzad2211. I'd be glad to help you and ensure that your account is properly set up and accessible for your journal entry.

To proceed with troubleshooting, please ensure that the accounts you have created are marked as active in your QBO Chart of Accounts. This is vital because only active accounts will appear in the journal entry dropdown. Double-check the account's status by navigating to the Chart of Accounts.  

Let's check the account is not made inactive in your Chart of Accounts. Here's how:

1. Open your Chart of Accounts.
2. Click the small Gear icon ⚙ next to the Printer icon, choose Include inactive.
   
3. If the account is inactive, click Make Active to reactivate it.
   

If you've confirmed that the account is active but still can't select it when making a journal entry, clearing your browser's cache and cookies related to Intuit can be a helpful next step. By performing this, you'll be able to determine if the issue is browser-related. Here are some shortcut keys you can use:

• Mozilla Firefox: CTRL + Shift + P
• Microsoft Edge: CTRL + Shift + N
• Google Chrome: CTRL + Shift + N
• Safari: Command + Shift + N

You'll want to clear your browser's Intuit-related cache and cookies. Too much cache or saved data can prevent accounts from displaying correctly. Let me provide this article for your convenience: Clear cache and cookies to fix issues when using QBO.

Furthermore, once you get back in track you can use this article in making a journal entry in QBO: Create journal entries in QuickBooks Online.

The Community forum is always available if you encounter any challenges while working on your journal entry or need further guidance. We're here to help you optimize your QuickBooks experience and ensure you get the most out of the software.