popped a warning message to before adding the data into excel sheet from user form

Hi, this is my code. I want to check if the data exist in the excel worksheet before adding. And if it does exist, popped a msgbox to continue adding the data .

1)Press the add button
2) check if the data exist
3) if exist, show msg "existing data.Are you sure to add the record"
3.1) If user click yes, enter the record
3.2) if click no, then clear data in the textbox and allow user to refill
4.If data not exist, enter to the last row


CAN ANYONE HELP SPOT AND CORRECT MY MISTAKE IN THE CODE?

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