Sometime you will want to add an image like your company or app's logo to your app bar, especially on your home screen.
In your app bar, make sure the Title text is blank.
Click the Plus button in the left toolbar to open the Add Panel
Click and drag and image onto your screen
In the left panel start to configure the image by selected Uploaded Image
Click Choose Image
You should choose an image file that is a .png so that the background area of the image is transparent
Set the Image Cropping to "Show Full Image (Don't Crop)"
Click Edit Styles
Select "Fixed Top"
Resize the image to be small enough to fit in your App bar and drag it up to the correct position