The flip up switch to rewind the film has fallen off, I have all the original pieces but cannot fit the bar in. How do I take off the rewind lever to fix it?

Generally the Rewind knob unscrews backwards. Put something in the sprocket slot that fits in the film canister and gently turn the rewind knob backwards (counter clockwise) It should release and then you can install the new one. I do suggest being gentle with this.

You haven't stated whether you activated the rewind knob before trying to rewind the film. Unless you do so, the rewind crank will not work.

The rewind knob is to the left of the lens mount (as viewed from the front of the camera), above the self timer lever and is marked with a letter "R". Turn it until the bar is horizontal and you should then be able to rewind.

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Usually the automatic rewind starts when the film roll has come to the end. You can rewind also before that by a rewinding button you'll find usually somewhere in the camera body.

To rewind manually, press the film release button (consult the manual if you don't find it) and use the rewinding lever to rewind the film. See this for inspiration: http://www.ehow.com/how_2028878_film-mm-manual-slr-camera.html

Sorry an answer is impossible without knowing the exact make and model of camera.

Set the film advance mode selector to L.

While sliding film rewind lever, push film rewind button.

Fold out film rewind crank and rotate until film advance indicator stops moving.

If you don't have a manual, you can download one from http://www.butkus.org/chinon/nikon.htm

anniehongx,

open the film door and charge the shutter. are the drive and take up sprockets turning? if they are then the film was not loaded properly. be sure to push enough film leader into the take up spool bars.
if the spools are not turning then a gear or spring ( advance lever return lock ) is broken.
there are no new parts for the ME Super however some camera repair shops have good used parts that can be used. get an estimate first.

Do you have film in the camera? If so, is it an old film or you have just loaded it?
If it's an old film, could it be at the end of the roll - to check this, 'lightly' turn the rewind lever backwards and forwards. As the camera is pointing away from you, turning the rewind knob clockwise will normally rewind the film (don't press the rewind button in, we don't actually want to rewind the film yet), turning the knob clockwise should be tight and a firm stop, if the film is at the end, you will feel the same tight firm stop if you turn it counter-clockwise. Don't turn the rewind knob backwards (counter-clockwise) too hard, you'll unscrew it and it may fall apart. If turning it backwards rolls freely in a full circle, then you have film left.
Another option is that, since it's been so long since you used it, the loading of the film may have gone amis and sometimes the cassette will flip backwards, jamming the film in place so it wont advance - if you have loaded the film and not taken any pics or have not been able to advance it at all, it should be safe to open the back as the film will be in it's original loading position, if you have left the film in it from some time and don't know what stage it's up to it may be best to take it to a camera store where they will have a "Black Bag" to put the camera in and manually open and unload the film. Make sure you get an experienced person - some pimply-face teen that's never used a film camera can easily put their fingers through the shutter while it's in the black bag - I've seen it plenty of times.
OK, that's enough to get started, did this work or do we need to try more options?

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Press the rewind button and wind the film advance lever, It will set to its place. Release the rewind button, press the shutter release button.Once again try wind the film.( provided your camera is not fitted with motor wind )

Pressing the rewind button wind the film advance lever,if it is free It will set to its place. Release the rewind button, press the shutter release button.Once again try wind the film.( provided your camera is not fitted with motor wind )
Then your winding gears need cleaning

there's a tiny black button to the side, beneath the rewind lever, press that as you pull up on the rewind lever