Stir with the spatula. The time will depend on how well you want the vegetables cooked. They should still be slightly crispy at serving time. After the vegetables have cooked as above, take the lid off the wok and add the shrimp, stir, add the rice and soy sauce. Stir for about a minute or two.
Some people use a cup or more.
Replace the lid. Let simmer for a short while. I let it simmer while I put the plate, fork, etc. Five minutes at the most. Now take the lid back off and stir again several times.