can someone please help with this problem?
Just cut the spent flower spike off.
What sort of orchid is it? If it's a phalaenopsis, common name moth orchid ie the ones sold in Supermarkets ikea etc when the last flower is dying look at the stem. Look for the first notch below where the first flower was and cut off the stem above it. With any luck the orchid will grow another flower stem from that point. Can't help if it's any other sort of orchid.