Disconnect a linkage between the temperature control mechanism and the steam valve. You can do this by pressing one part with a small flat-blade screwdriver while supporting the other underneath. Take care as these small plastic parts could easily be broken.

A linkage on the other side operated by the automatic steam control simply lifts off.

Slide both mechanisms back as far as they will go.

Note that on reassembly both mechanisms and the knobs controlling them must all be in their rear-most positions to ensure they re-connect correctly.