How can I create a login/register account for users on my form ? E.g. in the picture I uploaded

how can I change the time of when the message was sent to my local time 

Login forms are not possible using JotForm.  Since information is only collected and cannot be queried, it would essentially just be collecting usernames and passwords, which is actually against on our terms of use:

https://www.jotform.com/help/8-Terms-of-Use

Forms can be used to collect data from your users, but not for creating and managing user accounts.