How to make rounded tables
First you should design rounded header and footer in Photoshop or any other image editing software.
Get a sample of table with content, remove header from that table:
Then add rounded header.
1. Select rounded rectangle tool (U), change radius to about 5px, draw a rectangle where header will be:
Fill it with white color, rasterize layer (right-click on layer, select “rasterize layer”), remove part at the bottom of layer: