When add new user, the page is blank, no option to select.

Let's make sure to fix the issue, lei-klickit-com-.

Oftentimes, your browser is full of the accessed page that may have caused unusual reponses. You can log into your QuickBooks Online (QBO) account in a private window. Here are the keyboard shortcuts:

• Press Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox).
• Control + Option + P (Safari).
  
  

Once signed in, you can add the user again to check if it's showing a blank page. If not, go back to your default browser and clear the cache to speed up the loading process. Clearing it will refresh the system, and you'll be able to work with a clean slate. However, if the issue persists, try using other supported browsers. 

For more information about usage limits, read this article so you'll be guided. Please know that this may be in the US version but more likely works the same way as your region: Learn about usage limits in QuickBooks Online.

Fill me in if you need further assistance about adding a user. I'll always be right here to help.