I have a problem with Manage Engine ServiceDesk Plus

When I create a new incident I do not want to notify users with an email, just create a ticket. in fact I want to choose whether or not the user gets an email for every new incident I create and when closing a ticket. 
the problem is not due to the email beeing sent but for some cases I create I want to have a box I can unmark so a notification wont be sent. I already tried changing and browsing for a similair setting in ME, but nothing.
Can you help?
Thanks in advance