How do I find my alotted quota and increase it?

This form has exceeded its allocated quota.

You have already reached the available upload space on your account, you will need to upgrade your account to the next plan in order to get more upload space, otherwise you will need to delete the entire submission in order to delete the related file. 

https://www.jotform.com/help/377-How-to-Delete-Form-Submission-Data 

If you have any question, let us know.