In the developer's dashboard, go to the Profile > Basic Info, scroll to the Skills section, click on the Edit button, then scroll down. There you can add more skills, including your years of experience and proficiency for each of them.
Picture 1: Skills section on the Basic info profile.
If you want to enrich your profile by adding additional skills and technologies, you can take more quizzes in the All Quizzes section under your Core quizzes in the Quizzes section. Turing recommends that all developers take as many tech stack quizzes as possible because they can drastically increase the number of opportunities and matches you receive.
Picture 2: All quizzes section.
Note: If you fail to clear/pass your quiz, you can always return in 90 days’ time and retake it.