The Pay feature, which let you pay a BPAY bill with bitcoin, has been retired and is no longer available on the web platform or in the Bitaroo Express app.
Your past bill payments are still yours to retrieve. On the web platform go to Account > Reports, and in the Bitaroo Express app go to Account > Reports, where BPAY bill payments remain available as a report and as a CSV export.
Everything else on your account is unchanged. You can still buy, sell, send, receive and spend as usual.