Why doesn't my contact page show a 'submitted successfully' message?

[mobilespot]

As soon as click its not giving me message that "submitted successfully "
Its

say at same page please help

[mobilespot]

https://shopfordeal.com/pages/contact

[mobilespot]

Adding products now

If you want to add msg like when customer click submit i want to show msg to customer

thank for submitting how can i do it.

Example

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Dawn Theme