I am getting out of submission storage message?

I am getting this message when I checked the forms. Is there anything I can do to delete old filled forms? 

Hello wanganuipetmotel,

I did check your account and did not find any issue with that. Your account usage is well within the allowed limits and you should not have any trouble. Please check the screenshot below:

I would suggest you to please share the screenshot of the message you are getting and we will take a look. You may like to take a look at the following guide on how to upload image in forum post:  http://www.jotform.com/answers/277033 

We will wait for your response.

Thank you!