Postman

Hey.
  This is my first box on hackthebox.
  I’ve been trying to get through it for a long time. My efforts led me to a standstill.
 I find r**** port. Started looking for exploits. M***t found 4 exploits, only one worked. He returned the info. On the Internet, I found an exploit for the r**** r**** s. When starting, an error occurs - an unknown Module.
  He began to search further. Found a shell script. It should load the ssh key. Not working in my case. I get an error - the password is incorrect. I need help, help whoever can.