Thanks to your help I am very close to finishing the project.
When I come back to the users_Profile page (by clicking on the email verification link), I tried changing some values and clicked the UPDATE button. First I got the error message that the file users_Profile.PHP cannot be found, and after I corrected the path in the UPDATE button, the the page stays on the screen with the entered data, but the data base is not updated with the changes I have entered. What should I do to make the database receive the update changes?
I have added five more fields in the users_Registration.PHP (and in the DataBase)and I will copy the same to users_Profile also. Do I need to have the exact same number of fields in the users_Profile.php page as in users_Registration page to make the update go through?
By the way, I have added a LogOut link for the page and it works fine