How to add corners to the header, body, or footer:

First get into Design mode. Next, Click on body and choose the layer: header, body, or footer. Finally click on one of the corner tool icon to change the corners.

Here is how to add corners to the header, body, or footer:

Step 1: Get into design mode. 

Step 2: Click on Body tab. 

Step 3: Choose a layer: Header, body, or footer 

Step 4: Click on corners icon. 

Step 5: Select a corner and a length. 

Step 6: Click done. 

See example of image below.