Missing piece? i was working the other day, caught my watch on something, and the next time i looked down at it, it had quit working. then i noticed the knob where you adjust the time was missing, i found it and put it back on, but the watch still won't work. just wondering if i'm missing a piece or something?

take it back for a warranty inspection / repair or refund
maybe it is not genuine brand but a knock off in which case the manufacturer would like to be told about

Hi Jennifer

Two possibiities here one is electronic, unlikely but possible, and one mechanical that you can check.

When you changed the batteries did you notice internally the location of the button that turns the back light on? If you pressed the light button, did the button or a spindle move forward towards the body of the watch? did you notice a contact? or nothing pressed against anything?

When changing the batteries you would have click open the battery holding frame. This frame or internal back plate has around the light button a little piece of metal, like a finger that gets pressed by the button towards a contact in the body of the watch. This finger suffers metal fatigue and quite often looses its springiness or snaps altogether and loses it ability to make contact between the frame and the EL plate that illuminates the back of the watch.
If you are missing this contact perhaps you could buy a replacement plate from Casio. Can not advise as to the costs of doing it yourself or sending it to Casio. It is fiddly job.
Hope this helps

The Skmei 0931 S-Shock instructions are attached

You have to adjust the date every February (28 or 29 days), April, June, September and November (each 30 days). Self adjusting calendars are called Perpetual Calendars and this feature is quite expensive, especially in mechanical watches. Your watch has calendar ring with 31 days printed on and the simple calendar mechanism which is changing dates from 1 to 31 inclusive,day after day, so, when the 30-day month is ending and there is no 31st date to follow, your calendar is showing 31st anyway,instead of 1st of the next month. This is when you have to adjust date. Now about the date adjusting. If you pull out crown gently, you will notice there are two clicks (positions), not just one. So the first click, when crown is not pulled out fully, is exactly for day/date adjustment. If you pull the crown further out, watch is in hand adjustment mode. Try it carefully and you will find out the right position.
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I have found that some of these "automatic" Fossils also contain a battery. That is how that provide an automatic watch at such a cheap price. I recommend taking it to a jeweler to have them check this. If it needs repair it will likely cost near the watche's replacement value.

When your winding the month over prop it so that its not quite all the way turned around or just turned around this works for me. Hope it works.

Open the watch and lay it on the table dial down and winder facing you.
Get the hard steel needle and push down the small metal piece next to the to the place where the stem is entering the movement (on the left side). Pull out the stem while holding that piece down.
If thhat piece looks like screw cap (with the groove), then you have to unscrew it in order to get the stem out.
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I have an AW 150 watch. I looked everywhere for a solution to setting it. I found nothing. It appears that all types of this watch are hard to set. I happened upon the correct procedure for at least setting the watch.

My watch has 4 set buttons that you can push. 2 on each side. Hold the upper right hand button until something starts flashing on the watch. On mine it was the seconds. Then release the button. Now each time you push that button for a very short moment, the flashing part of the watch will progress through each area (minutes, hours, date, etc). When you get to the area you want to set/adjust, use the bottom right hand button to move up/forwards and the bottom left hand button to move down/backwards. When you have fixed one function push the upper right hand button to move to the next function you want to change and repeat the procedure. When you are done, hold the upper right hand button in until the watch quits flashing anywhere and then release the button. Your watch is no longer in the adjust mode. Hope this works for you. It drove me nuts until I figured it out.

Open the back of your watch. pull the stem ( winder) out and look for a small metal piece inside that moves as you do this. There should be a little dimple on the moving piece. The piece may be on then side next to the stem, or on the movement under the movement backing plate. Tale a tweezer or something like it and push in the dimple. DO NOT PUSH HARD!!! You want to try to pull the stem out while pushing down on the dimple( it's called the detent) as lightly as you can. If you push too hard you will mess up the whole stem assemly If you still have a problem please let me know..Good Luck!!

I would check the battery first, but I am going to put the odds on that it is a mechanical problem with the watch. It's not like in the old days when watches had a mainspring, where the power from the coiled metal was strong enough to push out any particals that got in the way of the gears teeth. Now they are all quartz, where any little piece of anything will stop the gears from running. If you haven't had this watch along time send it back via warrenty, if not it needs to be serviced.