I am on the Freeplan. Is it 100 submissions per month or totally altogether?

Please note that free account has 100 submission limits including 10 payment submissions. Submission limits are reset on the first day of each month and you can receive 100 submissions each month. 

You may like to take a look at the following guide as well which should help you: https://www.jotform.com/help/408-Understanding-Your-Account-Usage-and-Limits

Hope this helps.

Do get back to us if you have any questions.