Cannot approve submissions


I wanted to continue managing the list I have here:

However when I try to approve a submission from the Queue I get this error:

Free Account Limit Exceeded!

To add more than 10 items per day to your lists, please upgrade

I only want to add 1 item per day, not 10. Can you please let me know why I get this error so I can start to manage the list again?

Thank you.