what is the maximum number of submission for one form?

Hello,

You can quickly get information about each plan's limits from our Pricing page. 

As I see you are Using JotForm with a free plan, so your monthly submission limit is 100. It counts your total submissions, not submission by form. Either you use 1 form or 5 forms, you are limited to get 100 total submissions. 

You can check your usage from your Account's Usage page to check your usage. We also have a detailed user guide for understanding usage and limits.

Please review the guide here: https://www.jotform.com/help/408-Understanding-Your-Account-Usage-and-Limits