You have to open the PCB Footprint in the PCB Lib Editor for editing and then save the edited version with a unique name.
For more about PCB Libs please see the Tutorial:
[https://docs.easyeda.com/en/PCBLib/PCBLib-Create/index.html](https://docs.easyeda.com/en/PCBLib/PCBLib-Create/index.html)
and read:
[How to create findable footprints and searchable symbols](https://docs.google.com/document/d/1ZRkPPMID68mBz9j9RMIJARNSXK12PDULZXP7kiThvDg/edit?usp=sharing)
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