The resonance structure should look like this:
Work Step by Step
1. Identify the pi bond next to the positive charge: "Next" means that, there is exactly one bond between the pi bond and the atom with positive charge. 2. Draw the arrows: Follow the same pattern we have learned in the chapter. (Move the pi bond to the bond in the middle of they.) 3. Do the changes based on the arrows. * Don't forget the formal charges! 4. Repeat these steps for the third ressonance structure.