How to make reset button pin on Arduino UNO active?
It is already active, the only way to make it inactive is by cutting tracks on the board or adding a large capacitor between the reset input and ground.
What makes you think that it is not active?
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If by "active" you mean "turn it into an I/O pin" then you will need to change the configuration fuses. Once you do that you can no longer use the bootloader or an ISP to load sketches or bootloaders. You would need a High Voltage Serial Programmer or High Voltage Parallel Programmer to re-enable the Reset pin.
If you make it an I/O pin you can't use Arduino functions on it because it has no Arduino pin number. You have to use direct register access to read or write the pin.
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