All pads are automatically exposed copper. If you need to expose specific tracks select them then do:  If you need to expose a specific area then draw an outline using the sold Region (or a specific shape), add a netname to avoid a DRC error, select it then do: Using Solid Region:  Using Rectangle: 

You also have the **Gold Fingers** option in: [https://easyeda.com/order](https://easyeda.com/order)

I didn't mean exposing copper. If you look closer at the picture, the colored solder mask / paste mask thing has been removed from under the edge connector. I don't know if it makes any difference to anything, but my assumption is that this is often done to avoid scratching the paint and making shards of it ending up in the connector. In this video [https://www.youtube.com/watch?v=omUo3e03TkA](https://www.youtube.com/watch?v=omUo3e03TkA) someone seems to have ordered such PCBs from JLCPCB (though in the video you can see that the mask was left on the bottom side accidentally). There also seems to be chamfering to ease insertion into card slot.

Looks like they at least do the chamfer automatically if you select gold fingers. [https://jlcpcb.com/quote/pcbOrderFaq/Gold%20Fingers](https://jlcpcb.com/quote/pcbOrderFaq/Gold%20Fingers)

As described above, if you need to expose a specific area then draw an outline using the sold Region (or a specific shape), add a netname to avoid a DRC error, select it then do: Using Solid Region:  Using Rectangle:  This exposes anything under the shape copper or bare laminate.