Do like this bro!
<?php global $current_user;
get_currentuserinfo(); echo 'Username: ' . $current_user->user_login . "\n"; echo 'User email: ' . $current_user->user_email . "\n"; echo 'User first name: ' . $current_user->user_firstname . "\n"; echo 'User last name: ' . $current_user->user_lastname . "\n"; echo 'User display name: ' . $current_user->display_name . "\n"; echo 'User ID: ' . $current_user->ID . "\n";?>
Paste in any page you like to display lah!
https://www.isitwp.com/display-user-info/