Assistance Required to Fix Error in Duolingo Online Course Progress

I accidentally missed the 3rd section, thinking that the system would automatically fill in the information from the 2nd section. But then I realized that I didn't know a lot of things, and now I really wish I hadn't skipped the third section. Can you help me find my way back to the second section of the fourth unit? I'm requesting because I can't see where I stopped, and when I went back to Section 4th Unit by myself, I only got five points. This stopped me from moving on to the next level.