torn from the first moment of Oil Tank for chain lubrication, locking screw f. extension Plastic handle

Oil is at a standstill from the tank for chain lubrication, also the locking handle for the extension (plastic) is torn. How and where can I make the warranty claim?'ve Had it for a few weeks and it was only now use weather permitting! Handling and performance four stars. Would be nice if a soldering iron stand included've seen better. Tilts always to the side.