Starting Point - Vaccine - Got Stuck

for the starting point vaccine machine i had normal nmap scan and got ftp,ssh,apache services are running. I coundt able to find out any thing more.
try the brute force ssh and ftp with previous info. at starting point i just solve (archtype and oopsie machines only)
When i got check the walkthrough it tolds loging the ftp with credentials. but i couldnt see where he find that credentials?

You can find the credentials in the root directory of the previous machine. The Starting Point machines are related so it can be worth keeping track of known passwords, etc from previous machines.