How do I change the default WordPress e-mail ID for sent e-mail?

I have created a blog website at careerdemo.com and installed WordPress to run it.

When a person signs up, they get an email from the address wordpress@careerdemo.com (this is, I guess, a default setting in WordPress).

I want to change that, so that e-mails come from my own address,contact@careerdemo.com. (So any new user will get e-mails from my own e-mail address, contact@careerdemo.com.) How do I customize my FROM e-mail address?

Add the following to your functions.php:

add_filter('wp_mail_from', 'new_mail_from');
add_filter('wp_mail_from_name', 'new_mail_from_name');

function new_mail_from($old) {
 return 'your email address';
}
function new_mail_from_name($old) {
 return 'your name or your website';
}