Hi! I assume you mean that you want to put the component on the bottom side? In this case you select layer and change it to bottom layer.
BTW, mirroring a component on the same layer, in this case on top layer, is not possible. And there is a very logical reason why. However, you can press "R" twice to rotate a component 180 degrees...
Regards,
Markus Virtanen
HW / Electronics Designer
There is one case where mirroring a footprint on a PCB makes sense. This is described here:
[https://easyeda.com/forum/topic/Arduino-MEGA-Shield-Project-703d187346e74833af8114b2f6aa423e](https://easyeda.com/forum/topic/Arduino-MEGA-Shield-Project-703d187346e74833af8114b2f6aa423e)<br>
<br>
All other cases, as Markus says, do not make sense because they result in a mismatch between the pads on the mirrored footprint and the pins on the physical device.
Our website uses essential cookies to help us ensure that it is working as expected, and uses optional analytics cookies to offer you a better browsing experience. To find out more, read our Cookie Notice
Brand new interactions and interfaces. 
Easy to use and quick to get started. 