Oh no, actually before you do that have a look at this post. There are several Keys (passwords) that Steem uses. It was likely asking you for your Active Key or posting key. The one that you get in the email from registration is your master password key. it is used to unlock all your other passwords and or reset your passwords.

https://steemit.com/steemit-guides/@pfunk/a-user-s-guide-to-the-different-steem-keys-or-passwords