User Manual Russell Hobbs RHFM2363S 23 Litre Silver Flatbed Digital Microwave

The guarentee is for a year and it has to go back to the place of
purchase if faulty. For me it has been a good buy so far.

To alter the power setting press power turn the dial to required
wattage and then press the start/confirm button in the middle of
the dial to set it and then turn dial to required time. Then you can
press start again.

No, you should not use metal in microwaves as this can cause
damage to the product and potentially result in combustion.