It has a screw down crown. Turn counterclockwise to unscrew it. 1st position is to wind it. Pull the cown out slightly to second position to set the day and date, then pull the crown out to the finally position to set the time. When done push the crown back in and screw it back down.
Do not set the day and date when the time on the watch is between 10:00 and 2:00. I usually advance the time to 6:00 to set the day and date, then set the time.
There are some threads about the A7750. I would recommend you read about them as there are some do's and don'ts that you need to be aware of to avoid screwing up the movement.
Now post some Pics!!