Help Reset Password without disk

hello there have macbook 13.3 inch model a1181 version 10.7.2

want change password on computer not remember previous password

, not have installation disk , saw on youtube can change password , system turn off computer keyboard light , press command + s
can not enter @ all

if me happy

 

you can either order replacement discs model calling apple, or can buy retail copy of snow leopard.

 

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