On the first week, I've sent it and got the payment, Now I need to submit my report for the past week(2º week), but I can't because it shows that message, apparently we can submit only 1 report.
So how can I submit my weekly report ?

So, it means that participants can only submit their work for once only. I think this is some kind of bug in their website or maybe participants can only do the job for one week? Also, BM is not answering any concerns now, I don't know if you guys should continue or stop the work now since you can't submit your work.