You can place components on either side of the PCB: [https://docs.easyeda.com/en/Introduction/Shortcut-Keys/index.html](https://docs.easyeda.com/en/Introduction/Shortcut-Keys/index.html) points to the section of the Tutorial that describes two Hotkeys, T and B:  and in the FAQ: [https://docs.easyeda.com/en/FAQ/Editor/index.html#How-to-put-a-component-on-the-bottom-layer](https://docs.easyeda.com/en/FAQ/Editor/index.html#How-to-put-a-component-on-the-bottom-layer) Note that the footprints are always viewed from the top layer looking through the board.

Also be aware that JLCPCB can only assemble: 1. SMT parts; 2. on one side of the PCB.