Assuming, of course, that both devices actually have HDMI sockets, simply connect an HDMI cable between them and use your TV's remote control to set the input to 'HDMI' (or 'HDMI1' or 'HDMI2'. as appropriate). Without knowing the make and model of your TV, it's impossible to tell you exactly how to do that bit but my most recent post here might help if you follow the link:
http://www.theanswerbank.co.uk/Technology/Computers/Question1211296.html