There is not a power button on this particular model. Our smart TVs are all low energy consumption and so are not designed to power off completely, the power button on the remote or on the back of the TV will put the TV on standby but to switch the TV off completely you will have to switch off the main power button on the wall.
The HDMI and aerial connection can be found on the back of the TV. Please find more information on this by looking at page 5 of your user manual or by following the link below:http://downloadcenter.samsung.com/c...
Hope this helps,