There's a guide in the getting started guide:
If you just want a simple bolt hole, nothing fancy, use a single pin
connector as the schematic symbol, connect it to a net or not as
required, and skip down to:
The second paragraph is "Footprint pads". You just need to create a
single through-hole pad of the correct dimensions.
Once you have your footprint saved, you can go back to the schematic
symbol and select it in the symbol properties.
Regards,
Robert.
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