How do I recover my Homegroup password in Windows 10?

[Windows Central Question]

I had not used Homegroup in 8.1, but I set up one and was given a password which I printed out. When I purchased a Desktop I did the same thing and was given a separate password. I have the first password on hand but the other one has not to be found. I guess I need that one since Wndows 10 is rejecting the 1st password. How do I recover the 2nd password?