While testing Registration form, the best way is to use automation script rather than manual testing which is time consuming. Automated script helps to get better results in shorter time. Like we can generate random users with the script and test the form with multiple hits at the same time.
In Registration form we have some common fields like First Name, Last Name, Email, Re Enter Email, Password, Re Enter Password.
storeValue command will store your random Email and add it in the Re Enter email field(email2). Same case is implemented for password field.