Iterating a procedure by clicking on a button in user form

Hi there.
I have a user form with some text boxes for user input, also there is a Add button. I want each time user change texts in text boxes and click on add button it adds the values to new row in my active excel sheet without loading the sheet again and again. My problem is I can do it just one time, by each change in textboxes and click it over write the new values in the same row.
this is a simple sample of user form:
New Picture (3).jpg

I am writing the code on Button_click event of user form.