Is there something wrong with the Petronami interface? We do not see any appointments available.

I dont see a way to pick an appt date/time on the visa booking page :( tried both chrome and firefox

During busy months, appointments are taken as soon as they are released, often up to 3 months in advance. Your best bet is to keep checking the site so you can snap up newly added appointment slots, or those that reopened because someone else cancelled.