I can't add products and services items in Quickbooks Plus. When I click the green button labeled "Add an item", nothing happens.

Hello, rl-langner-com. I want to help you successfully utilize the Add an item button in QuickBooks.

Can you share with me if you got an error message? This helps me check more resources and provide correct information. You can also provide a screenshot just make sure to cover all important details.

Still, we can verify if it is a browser-related issue. Let's follow the recommendation below to resolve this unexpected behavior.
 

1. Refresh your browser by clicking the Reload icon or pressing F5 on your keyboard.
2. If the same thing happens, we can log in to your account through an incognito window. 

• Google Chrome browser: Ctrl + Shift + N
• For Mozilla Firefox browser: Ctrl + Shift + P
• For Safari browser: Command + Shift + N

If it works, let's clear the browser's cache. This helps remove its stored cache so QuickBooks will perform efficiently.. Aside from that, they can use other compatible browsers.

Please refer to this article to see different information on how the four-item types help you categorize the products and services for better tracking: Change product and service item types in QuickBooks Online.

Please let me know how it goes. I'll be around whenever you need assistance. Take care and have a good one, rl-langner-com!