Can you guide me to set my watch Casio WR 20 Bar

"G-Shock WR20BAR" could mean hundreds of different G-Shock models. If yours is an all digital G-Shock, the answer is fairly simple. When looking at the watch face, the upper left corner button is the "ADJUST" button. Press and hold the ADJUST button for a couple of seconds. You should start to see something flash on the display. Some models will have many options to select in ADJUST mode. To scroll through them, press the MODE button, which is in the lower left corner. You set the hour, minute, seconds, month, date, and year each separately. When you are done, press the ADJUST button again and you'll be back to normal time keeping.

If you want to learn more about your G-Shock, there is something called a "MODULE" inside it that is the brains of the watch. You can find that on the back of the watch, outlined in a rectangle. Usually a 4 digit number. You can download the manual for your watch using that number, if you enter it on a CASIO website:
http://support.casio.com/en/manual/manuallist.php?cid=009

go to link below
http://support.casio.com/en/manual/manuallist.php?cid=009

www.citizenwatch.com/en-ca/support/setting-instructions/

you can get instructions in video form from the link below
http://www.citizenwatch.com/en-uk/support/setting-instructions/

Use this page to download a copy of CASIO watch manuals in PDF format. To download a PDF file, enter the four-digit (or three-digit) module number marked on the back cover of your watch.

http://world.casio.com/wat/download/en/manual/

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These watches do set themselves during the night. The watch come with a battery fitted so this should not be your problem.

You can get instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals", watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

mcdevito75 here, Contact Casio for a new manual at, 800-706-2534 Optn. 2

Go to the Casio site "casio.com".
Select "support", then "manuals", then "watches",
Accept terms and conditions,
Then select "watch manual archive"
enter the number off your watch and click on "search"

Follow this link:

http://world.casio.com/wat/download/en/manual/

Rate,please.

Hi Try www.casio.com you will need your 4 figure model number to locate manual.