Using the BOSS Katana-100/212 is easy. First, plug in your guitar and turn on the amp. Adjust the volume according to your needs. If you're at home and don't want to be too loud, use the Power Control feature. To access different tones, explore the built - in effects. You can use the free BOSS Tone Studio editor software on your computer to customize these effects. When you're done, turn off the amp and unplug it from the power source. For maintenance, keep the amp in a dry place and clean it regularly with a soft, dry cloth. Avoid exposing it to extreme temperatures or humidity. Also, be careful when handling the speakers to prevent any damage.