Hi Team , I have a requirement where i have to put a pop-up (alert)

Jasleen,
You can take a copy of your form and convert all the values to read only and populate the default value with the saved variables. This form can be activity chained to after the data input form and be used as a preview of the keyed in values. If you allow the users to step back to the previous form, then they can adjust any mistakes they may have made.