Find and Select the PCB footprint you wish to edit by searching for it in the libraries (General Packages Through Hole or Surface Mount or in More Libraries or, if it is a part you have created, in My Parts).
Click the little Edit pencil icon to open it in the footprint editor.
Select the pad you wish to edit. To delete it, press the DEL key.
Save the edited footprint with a new name.
In your Schematic, select the component(s) you wish to apply the new footprint to and edit their
Properties > Custom Attributes > package
to the new footprint name.
Then, in your PCB layout, delete the corresponding footprint(s) in your PCB then do
Super Menu > Miscellaneous > Import Changes...
If you have created the PCB directly without drawing a schemaitc then you can find out more in this thread:
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Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Find and Select the PCB footprint you wish to edit by searching for it in the libraries (General Packages Through Hole or Surface Mount or in More Libraries or, if it is a part you have created, in My Parts).
Click the little
Editpencil icon to open it in the footprint editor.Select the pad you wish to edit. To delete it, press the
DELkey.Save the edited footprint with a new name.
In your Schematic, select the component(s) you wish to apply the new footprint to and edit their
to the new footprint name.
If you have created the PCB directly without drawing a schemaitc then you can find out more in this thread:
and in the EasyEDA Tutorial: