Lay it on its back to see if access is available from underneath. Usually 2 screws at rear at the bottom (remove before laying it on its back), underneath will be 2 more screws to remove base plate or it could be 'hinged', drop down plate and lift away. The base flood overflow float will need to be disconnected, 2 wire connectors pull off, could have release clips so if stubborn to remove push in the small clips and pull off.
Now you should have access to the waste pipe that connects to the pump.
The waste pipe retaining clip (rear panel) should just twist to release.
Pliers to remove the clip holding pipe to pump.
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