Most Samsung TVs have a power button at the bottom or on one of the sides of the body of the device. The power button, on most Samsung TVs, doubles up as a navigation button. Using the power button present on the Samsung TV, you can perform some activities without requiring the remote. This includes functions like changing the volume of the Samsung TV, changing the source of the input, or even surfing between channels. However, the functionality of the Power Button is limited to just these things and you can't access the Settings option using it. Thus there isn’t a way you can connect to the WiFi using just the Power Button if you don’t have the remote for your Samsung TV.