The tension is adjusted on the pedals. You need a hex wrench - metric, not sure which (small) size. The pedals that I am using have plus and minus signs next to the adjustment screw, to show which direction to turn the screw to loosen (-) or tighten (+). Sounds as if you need to loosen the tension to make it easier to clip in.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer