HT5787 I made a HD with Yosemite to be used as a startup disk. I have forgotten the adm password for this disk. How can i reset the adm password?

Change adm login password running the MacBookPro from an external disk.

Restart holding the Command and R keys, then from Utilities on the menu bar select Terminal.  When the Terminal opens, type at the cursor EXACTLY:
resetpassword
and press Enter.
When the Reset Password window opens, select the drive then select the user account.  Type a new password twice, leave the Hint blank, Save and accept the next dialog that opens.  At the bottom of the Reset Password window agree to reset the user's home directory permissions,
Go to the apple left side of the menu bar and Restart.

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