First, lift up the pot. If it is light, then it has little to no water. Soak it in a five gallon bucket in water to the top of the pot. When potting soil dries out it is very hard to get it wet again. After about an hour lift the pot out and see if it is heavy. If it is then you know that the pot has taken in water. You do this only when the potting mix has nearly completely dried out.

The pot looks too small for the plant. When that happens the roots will be crowded and the mix will become dry, needing watering 2 or more times a day. That size pepper should be in a five gallon pot. The easiest way to tell when the plant needs water is to pick it up and see how heavy it is. When you know the pot is full of moisture lift it up see how heavy it is. Then, when you check for moisture, just pick it up again. If it is significantly lighter, then it needs to be watered.