There are two ways of interacting with a prop:
Step 1. Add a regular prop to your set (see: how to add props to a set).
Step 2. Close the Props menu.
Step 3. Reach out for a prop with one of your controllers until the prop highlights that you're within range.
Step 4. Press and hold your grab button to grab the prop and move it around with your hand.
Some props have special effects that happen when you press your index finger trigger while holding them.
Step 1. Open the Props menu and got to the All Props > Decor category.
Step 2. Find and add the Magic Pencil prop to your set.
Step 3. Close the Props menu.
Step 4. Grab the Magic Pencil prop then, while holding it, press your index finger trigger to begin drawing.
Learn more about how to draw your own props with the Magic Pencil.
Next: How to resize props