Help Reset Password without disk

You can either order replacement discs for your model by calling Apple, or you can buy a retail copy of Snow Leopard.

 

Since you are using Lion you can reset the password using your Apple ID (as long as you have one) !!

see http://www.macobserver.com/tmo/article/os_x_lion_resetting_your_account_password_with_your_apple_id/

You will lose your keychain logins though.....

 

To which post are you referring to with your cryptic reply?

 

I do not understand, what you mean with

But I guess, you can't enter a password you don't remember, if you refer to the guide logana linked you to?

And what about the option, GGJstudios gave you?
And can't you reset the password via booting into the Lion Recovery partition?

OS X Lion: About Lion Recovery
Lion Recovery Disk Assistant