Thread: Regarding changing core files

Regarding changing core files

I am developing a site for my client and he needs that the registration form should have Name, phone number and acceptance of terms and Conditions box.
Would like to know - Which plugin is recommended to achieve this ?
- Also, I need to change "Welcome username" to "Welcome Name" in top user bar. Its there in functions.php file.
How do I get the name of the user from the global variable $current_user
Username has been fetched by $display_user_name = cp_get_user_name();