Advice on this orchid please

My parents were given this orchid weeks ago as a gift (from Tescos) and they pretty much left it (and misted it every 2 weeks).

Now they’ve gifted it to me to look after. I don’t know much about gardening but would love to keep this orchid alive since it’s so beautiful, any ideas on what to do next? Some petals have already fallen and one of the leaves is yellowed so I assume I have to act soon.

Any advice would be really appreciated!! Thank you