Let's see how to make a question message symbol, you can make it by this example.
Draw a circle: Choose "4f65ef" color and Ellipse tool (U key) to draw a circle shape.
Effect: Go to Layer menu > Layer style > Bevel and Emboss.
Your will get it.
Inset symbol: Choose Horizontal type tool (T key) and make formatting then type question mark by your keyboard.
Effect: Go to Layer menu > Layer style > Inner Shadow.
This is your done.
Recommend the tutorial