To complete the portfolio, go to the top menu. For freelancer → Data editing and go to the Portfolio tab.
You can add files with previous work or link to external sites where you post the previous work. A freelancer with a completed portfolio is a requirement for posting job offers in several categories. You can read more about what to add to the portfolio here. The "About me" section is a part of introducing yourself to potential clients and adding extra information that is difficult to show in your portfolio, such as the education background, certificate, and so on. The "About me" section does not influence the possibility of sending job offers, and the completion does not fulfill the portfolio section. You can also provide information about industries, niches, and skills.