It looks like it's just snapped into the frame, but first verify that there are no screws going through to the cover from the back of the machine - look for any hidden by stickers, especially those with warranty or date markings. Pull off the knob (look for set screws first), and remove any screws or shaft nut hidden by the knob. Get a piece of hardwood scrap (red oak is best), and cut four strips about 4"-6" long by 3/8" wide by 1/8" thick, and taper one end of each of these to 1/16" width. These will be used to help remove the cover without ripping the edges to shreds.
Insert a small flat blade screwdriver into gap between the cover and the frame, and carefully probe for any hooked tabs. When you find one, slide one of the wood spudger strips in next to the screwdriver, and use it to push on the tab and lift the cover away from the frame. Leave the strip in place to keep the tab from re-engaging the hook, and slide a second strip in along the gap until you find the next hooked tab. Repeat with the remaining strips. Now you should have enough of the cover loose that you can slip in a big piece of cardboard to hold the middle hooks off. That will let you use the middle strips to continue unlatching the cover.
I've never seen one of these units up close, but this procedure works on flat-screen computer monitors. The manufacturer's photo very strongly suggests a similar construction.
The unit has a one-year warranty. Here's the link to the manufacturer's toll-free Customer Support:
1700 PSI Electric Pressure Washer Greenworks
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