You need to compress the two lock tabs. This can be done with two large screwdrivers, Slide the flat blade of each driver down between the tab and the side wall of the wheel mount. Twist each driver to push the tabs in and get someone to pull the wheel out. I found a piece of copper pipe I use it's just the right size to slide over the wheels top and push the tabs in.
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You need to compress the two lock tabs. This can be done with two large screwdrivers, Slide the flat blade of each driver down between the tab and the side wall of the wheel mount. Twist each driver to push the tabs in and get someone to pull the wheel out. I found a piece of copper pipe I use it's just the right size to slide over the wheels top and push the tabs in.