You could try looking and searching on the official companies website for your wrist watch and see if you can find the instruction manual. Or you can always try searching on Google too.
Could you comment below with the exact make and model this is please. This will make helping you a lot easier. Because I don't know this information this method is based on the most common method used for most digital style watches.
You will probably need to use the 'MODE' button on the bottom left corner. You will either need to keep quick pressing the MODE button until one of the areas starts to flash or you press and hold the MODE button for about 5 seconds to go into settings mode. You then use the + and - buttons, (top and bottom right corners), to change the numbers. To move between the hours/minutes/seconds you will probably need to quick press MODE button.
Setting Instructions
https://www.accutimewatch.com/instructions
and here
https://www.fixya.com/support/t26812435-set_time_date_batman_kid_digital_watch
Secret Button mentioned on Fixya
If it is the Batman watch that has a secret screen that lights up when you pushed the bottom middle of the watch face this is what worked for me.I call that secret middle button the mode button.
Push and hold that secret button on the watch face until the hour side of the time starts to blink. let go when you see the hour blink and then you can keep pressing to change the hour. to change the minute I let it go back into sleep mode then press and hold the secret button on the watch face and when it starts to blink let go for half a second and then press down and hold that button again and a minute numbers should start blinking. when they start blinking let go and then push once for each minute. it seems once you start one of these cycles letting go for half a second and then pressing and holding the mode button works. you'll have to experiment with how long to let go and then push.
Posted on Jun 06, 2014
https://www.fixya.com/support/t17486617-accutime_batman_watch_time_setting#answer33695601
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Looks like you put it into a $3,000 winder!
How to put watch in Wolf Winder?
To put your watch in the winder, remove the cuff by pinching the two outside wings inward and pull. Close your watch's strap or bracelet before placing the watch on the cuff. Compress the cuff, then slide your watch over the cuff, the watch face should cover the WOLF logo.
Pull the crown to first click. Turning one way changes DATE, turning the other way changes DAY. Fully pulled changes the TIME. (Based on my Rolex Submariner)
Google
make model manual
They are all out there. Here a few for your mystery watch. Number one tip, FULL Make and Model in every question please.
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