HP Laptop to HD TV

I have just purchased a HP Laptop Pavillion g6-1216TU running Windows 7 home Premium 64 bit.
I was wondering how I connect this to my HD TV via a HDMI cable. I can plug into the HDMI3 input on my TV.
Which buttons on my laptop do I press beside the fn button, is it the F4?
Any help is appreciated.
Brian