Macbook Air Lion OX S 10.7.5 Need to reset second Admin Password

I have three user accounts on my Macbook Air 11-inch (late 2011 model). Two are designated "Admin" in the "Users and Groups"
I changed one user account password, thought I saved the password hint via email to myself and now find I cannot log in either the new password or the older one. It is one of the two user accounts that are designated "Admin"
The other Admin user account works just fine and I have not lost that password. It is the original Admin account that I set up when the computer was new.
FireVault is turned OFF for the disk "Macintosh HD"
If I understand this correctly, since this MB Air has FireVault, I cannot reset the user account password using my Apple ID.
So how do I change the password?
Would I restart by selecting "Recovery disk" at book by holding "Option"?
Or would I restart while holding "Command+ R"?
I've never had to do this before, so I am a bit hesitant to start rebooting with either of the above methods.
Repeating that, yes, I do have the master password for this Macbook Air. My software is up to date. There are two admin user accounts and I have lost the password to only one of them. Running OS X 10.7.5
Thanks for any help.

Reset Password using Recovery HD
OS X 10.7 Lion /10.8 Mountain Lion
Follow the instructions in the first and third boxes.
http://pondini.org/OSX/Password.html

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Macbook Air Lion OX S 10.7.5 Need to reset second Admin Password

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