You will need to follow this step THROUGHOUT THE GAME.

When you encounter Fredbear, click until you see the "DONE" button.

DO NOT CLICK IT.

Wait at the part where it reads "DONE".

Again, DO NOT CLICK DONE WHILE WITH FREDBEAR, OR YOU WILL NOT GET NEEDED INFORMATION.

After waiting, the scene will change and will look like this.

He will tell you what to do. Follow what he says.

Do this step every time you see fredbear.

He will give you important information.

When you see the "Clocks", walk into them and make sure to complete the thing it brings up.

If you beat the game while doing this, there is a secret ending.

I have yet to finish this by myself, but so far I have done exactly this, and it has worked.

Play the game like you normally would, but only listen to what fredbear tells you to do. Go the same places, but if he tells you "Do this first and then do that", do it.