The „AvrDude GUI can be opened using the entry in menu „Tools“ or using the appropriate button:

Window with AvrDude GUI:

All fusebits where changes are considered to be risky are only available when „Expert-Mode“ is activated. For the function of the fusebits, please refer to the respective datasheet of the microcontroller. Microcontrollers were often shipped with active CKDIV8 fusebit. Thereby the controller clock is divided by 8. In this case, a low IPS frequency may be necessary to ensure proper communication with the microcontroller.