How do you change the film speed of a Nikon F65 film slr camera?

I just started using a Nikon F65 film slr camera and need a bit of help with it. I've used a slr film camera before but it was all manual. Do I need to put in the film before I change the film speed? And how do I do so?|||The F65 supports DX coding (not to be confused with the DX sensor/lens format) - it will automatically detect the speed of most films. Check the box of the film if it's "DX coded".|||you have to buy film of what ever speed you want, 200, 400 and so on. It's not like a digital camera that changes speed for you, you have to buy the film at a certain speed.