Using reloaded cartridges is easy for most basic Kodak Instamatics like the 100 or 104.
1. Press and hold the shutter button down.
2. Push the film advance lever to the front and release it. Repeat.
3. Release the shutter button. Hear click
4. Gently wind the Film Advance lever again for a short distance until it stops. Now release it.
You are ready to take a snapshot.
Remember, Instamatics are clear sky sunny-day cameras with tiny slow lenses.
You will get sharper photos if you prop the camera against a wall, tree, or car with a pocket tripod
See the tips for each recommended Instamatic model at the end of this Instructable.