Hint for HELP

I am super lost on what to do on this box. I have done what I believe is the right thing, but I am having trouble pivoting off that point. I have looked at the source code, looked at the exploit(s) you can do, but I am not sure HOW to use them myself…I should also make it known that I am very new to hacking in general and using Kali to its fullest. Anyways, I can outline what I’ve done in more detail if someone can help me out!