How do you use the outer ring for underwater timing to how much air is left in air tank. And is there a PDF down load of the Rolex submarier user manual?

Its time for a service.
Take it to any Rolex re-seller that offers repair or to any good timepiece service center. If its a vintage piece i would recommend sending it to Rolex, paying the extra cost to receive the watch with full Rolex repair documents and service history. The Rolex web site has information on this. Also this company does a fine job on Rolex repair. https://www.bobswatches.com/rolex-repair-service

its not the manual, but this might help:
the three button chronograph would be brought together in the form of the 5034. During the next fifteen years the 5034 changed into the 6034, which then became the 6234. This in turn became the 6238 and then finally evolved into the 6239. These changes although little by little had inspired Rolex to revive the previously shelved name the "Cosmograph". The only difference between the 6239 and the 6238 was that on the 6239 the bezel was engraved with tachymeter graduations rather than having them on the dial. The last major changes to the manual wind chronograph came in the late 1970's when Rolex introduced the 6263 model. This was the first model to have truly waterproof pushers. The earlier Oyster Chronographs had simple round pushers with internal gaskets as the only sealing mechanism. The screw down pushers were added to stop people pressing the buttons, whilst submerged in water. The locking function also prevented the chronograph being activated inadvertently. The new 6263 started life as being waterproof to 165 feet, ten years later it was capable of twice that depth (100 meters) The 6263 is unusual in the fact that the quality of the movement depended on which case you had. The steel chronograph movements were not timed to a chronometer standard. Despite the innovative design it was not until 1986 when the popularity of the Daytona started to increase, reaching its zenith with a particular Daytona model, the "Paul Newman". This model featured square markers on the subsidiary dials, and an outer track the same colour as the subsidiary dials.

To find a registered repair person in your area.
GOTO:
http://www.watch-clock-makers.org/
Hope this tip helps.
r/ David
http://antiqueclock.clockstop.com/

You can download the user instructions by going to their web site "croton.com".
Select "customer service" from the menu at the bottom of the screen,

Select "warranty and instructions" from the menu.

Move the slider on the right hand side of the screen down to the bottom and click on the icon.

A generic set of instructions will appear for their watches.

I have examined the Rolex web site and it did not appear to have any downloadable instructions.

The best I can suggest is that you go to the Rolex web site (www.rolex.com/en/index.jsp) , select "site map" from the options at the bottom of the screen.

Now select "store locator" and find the nearest Rolex dealer to you.

I feel sure that they will be happy to explain all the settings and might even be able to give you a copy of the user instructions.

Come on man, go buy a truly Rolex, not a fake! What a shame!!!

You need to go to a place that sells watch and jewelry supplies, because there is a certain tool for opening a Rolex. I am interested in knowing why you need to open it up though. If this is a Authentic Rolex ALL womans Rolex watches are automatics. Try unscrewing the crown (the part used to set the time ) counter clockwise and then clockwise turn the crown and listen to hear it winding, if it is infact an automatic, wind it 50 times. After winding, push crown in ( it is spring loaded) and screw in clockwise. It should run. If wearing every day you will not have to wind again, if wearing less frequently rewind as specified.

It is primarily cosmetic - the bezel was originally designed for diving, military activities or similar where counting down time was critical. Before digital stopwatches etc were built into watches as a feature, what you did as a diver was turn the bezel to the time (say 30 minutes) of air you had left, then the minute hand would travel around the face to the position 0 on the bezel, telling you 30 minutes had passed. You often find compass directions, various job specific calculators etc on bezels also, but unless you need a stopwatch / time reminder and don't have that feature in the watch itself, then it is purely a tradition to include a rotating bezel. The original bezels would have the time markings going the opposite way to the watch face usually, however on many modern watches, they often go the same way, allowing you to see how much time has passed, rather than how much you have left. Hope this clears things up :)