Curling

Okay, I’m struggling. I managed to find user.txt but couldn’t download or read it. I found p*******_b***** but I don’t know what to do with it. And then the entry point that I was using was closed. I have seen that I can use c*** to upload a payload but I can’t seem to get it to work. Any help, hint, etc. would be great. Please PM with any suggestions.