PC user does not know the password changed despite his previous password WITH VIDEO TUTORIAL

We hope to see the title had revealed that the write today. We all know the computer when no user password
this means that the password to open the PC or laptop is provided for security, with the aim to change the password when
and like the old password, the new password to the course before.
Now suppose you have the old password
not know, and not even knowing what it is that you can change the password....................
Yeah this thing you see today. So post up some screen shot interest seems to have made it easier to understand, you will not receive fear.
Let it........................................................
Right click on my computer first by right click manage, see below............and follow my image instruction...