Hey Madumz - you are well on your way. After getting the green Android robot with the text "No command", you need to short press the Power key/button to display the Android system recovery menu. Note, Scroll with the Volume Up and Down keys and select or confirm your selections using the touch Menu key that looks something like: [=] at the bottom of the device's face)
Please comment further below and we will be happy to further walk you through.