What I need exactly the steps to solve this and doing this challange as followin

What I need exactly the steps to solve this and doing this challange as following:(This following instactions the professor instructions)
Last class I went over the start of the user level exploit chain of attack on a Hack The Box machine named MonitorsThree.
https://app.hackthebox.com/machines/MonitorsThree
To earn Homework Full Credit you must get the USER FLAG submitted on your HTB account.
To earn the extra credit you must get the ROOT FLAG submitted on your HTB account.
Extra credit will be assigned to your lowest grade category.
Please submit your HackTheBox Account Page url for credit. (Your url should look something like this:
https://app.hackthebox.com/users/123
You can find your account ID for the url by visiting https://app.hackthebox.com/profile/overview and getting the number to the right of your username and replacing the 123 in the example url with it.