submitting more than one entry for a form per user

I'm unable to have the same user submit entry form more than once. How do I override that system, particularly when that user needs to edit an earlier submission?

It seems you have another thread for the same question:

https://www.jotform.com/answers/1574749-I-m-unable-to-submit-more-than-once-for-a-form-How-do-I-allow-for-multiple-entries-for-one-user

The answer is the same as given in that thread, it is likely that unique submission check is enabled: https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form 

Simply select "No check" to allow multiple submissions: