Welcome, @Community member, to the community!
where would you like to have a button?
As a software button: it can already be found within the STM32CubeProgrammer on the left-hand side under the CPU item.
As a hardware button: you can add it to your design at any time: just connect it between NRST and GND. It is already present on NUCLEO, DISCOVERY or other ST boards.
Regards
/Peter
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