Yes, the username is your Gmail email address.
What should i do after it, its a little complicated for me to understand, i have uploaded the PHPmailer folder to the htdocs folder.
The instructions in the article aren’t very “monkey see, monkey do”, because they do assume a certain level of PHP coding experience. Building a PHP contact module into a website with little PHP experience is really hard.
If you’re using some kind of pre-existing system or CMS to build your website, you may check if it has any options to send email with SMTP.