How do i put a lens on a 35mm camera?

also, i can't figure out how to work the darn thing!! how do i get the film in, how can i attach a lens, where does the flash thingy go, which flash thingy do i choose ( i have three) and how do i open up the camera itself?? thanks for your help!!

also, i can't figure out how to work the darn thing!! how do i get the film in, how can i attach a lens, where does the flash thingy go, which flash thingy do i choose ( i have three) and how do i open up the camera itself?? thanks for your help!! and if this helps, its a Nikon camera

First tell me what kind of camera you have and maybe I can help you with loading the film. The lens should have a red or white dot on it and your camera should too. When putting the lens on you line up the two dots and then you turn to lock it in place. You should feel it click. I assume you are talking about the hot shoe, your should have a metal bracket on the top above the view finder and on the bottom of your flash there is a metal shoe that will slide right into the bracket on your camera. Once you get it on there is a wheel you turn just above your shoe on your flash to tighten them together. To open your camera, I am guessing
that you have an old manual which is great, if there is not a button on the side of the camera near the back door then there is a dial on the left side of the camera that you can pull straight up and the back should release. Hope this info is help-full. It is hard to help you without seeing or showing you how to work it.

A Nikon what? Nikon makes/made A LOT of different cameras. It would help greatly if you could tell us the model.