OK, next grab Pen Tool (P), make sure it’s set to drawing Shape. Then try to create a similar shape to mine. Make sure you change its color to white.
When you’re done with the shape, then the most important thing here is to go to layer Properties and set the Feather of the shape to 2,0 px – this will give the shape edges a great soft feel. If you don’t see the Properties, go to main Photoshop bar on the top and choose Window > Properties.