I have lost my remote and so I want to know where the power button is on the TV it’s self? It’s not on the front or side or the back that I can see pretty frustrating I must say!

It might vary by brand. Who makes your Roku TV? I believe my Sharp has a power button sort of hidden in the back, but I honestly don't remember. Since the TVs support IR remotes, you should be able to buy a generic IR remote that will work with it. Just check the packaging to see if Roku is listed. 

I know its old thread. but steal i answer, The TV power button is located on the underside of the TV.